Continuing Education Activity

Thumb sucking is classified as a nonnutritive sucking habit, which also includes using pacifiers, chewing on blankets, and sucking on other digits for comfort. This behavior serves a self-soothing and regulatory function in early childhood. These habits are common in young children, who typically stop on their own between ages 2 and 4. This course focuses on 3 major adverse outcomes: dental malocclusion, skin conditions, and social issues. This course reviews how to assess and manage nonnutritive sucking behaviors and highlights the importance of the interprofessional team in caring for patients with this issue, providing healthcare professionals with the knowledge and tools necessary for effective evaluation and treatment.

Objectives:

• Differentiate age-appropriate thumb sucking and other nonnutritive sucking behaviors from persistent behaviors that place children at increased risk for complications, including dental malocclusion, skin conditions, and social issues, to guide timely counseling and intervention.
• Identify the typical clinical presentation of pediatric patients with thumb sucking and other nonnutritive sucking habits.
• Implement evidence-based management and treatment strategies for pediatric patients with thumb sucking and other nonnutritive sucking habits.
• Collaborate with the interprofessional team to improve outcomes for pediatric patients with thumb sucking and other nonnutritive sucking habits.

Introduction

Thumb sucking is a common nonnutritive sucking behavior, alongside pacifier use, blanket chewing, and sucking on other digits. These behaviors serve a self-soothing and regulatory function in early childhood.[1][2] Nonnutritive sucking habits are developmentally normal and typically resolve spontaneously between ages 2 and 4.[3] However, persistence beyond this age may lead to clinically significant complications. Prolonged thumb sucking has been associated with dermatologic conditions, including nail deformities and paronychia; dental malocclusion, particularly when the habit persists during the eruption of the permanent dentition; and social challenges, such as teasing or stigma among peers.[1][3]

Considering these potential outcomes, clinicians play a crucial role in distinguishing age-appropriate behavior from persistent habits that need intervention. They can offer anticipatory guidance, advise families on evidence-based behavioral strategies, and recognize when a dental referral is necessary for children with persistent habits at risk of malocclusion.

Etiology

Sucking is a primitive reflex that emerges in fetal development and is among the earliest oromotor behaviors.[4] This innate reflex underlies both nutritive and nonnutritive sucking and reflects normal central nervous system development; patterns of nonnutritive sucking may also serve as an indicator of neurologic integrity.[5] Sucking behaviors are broadly classified into nutritive sucking, which includes breastfeeding and bottle feeding, and nonnutritive sucking, which involves oromotor activities not related to feeding, such as thumb sucking, pacifier use, or sucking on other digits or objects.[4] Although pacifier use is more common in early childhood, thumb and finger sucking often persist longer and are associated with a greater risk of complications. For the purposes of this review, thumb sucking encompasses the full range of nonnutritive sucking behaviors.

Nonnutritive sucking is a normal developmental behavior that serves an important self-regulatory function in infants and young children. This behavior provides comfort, promotes a sense of security, and helps regulate emotional responses to internal and external stressors. Caregivers often introduce pacifiers to soothe infants, which can reinforce these behaviors early on.[1][2] The calming effects are mediated through multiple physiologic mechanisms. Sensory stimulation during sucking promotes oxytocin release, contributing to stress reduction and a sense of well-being.[6] In addition, sucking is coordinated by brainstem activity that integrates sensory input from oral and perioral tissues, reinforcing its soothing effects.[7] Together, these mechanisms underscore the close association between nonnutritive sucking and a child's psycho-emotional development.

In most children, thumb sucking resolves spontaneously between ages 2 and 4 as their self-soothing and emotional regulation skills mature.[2] The clinical significance of nonnutritive sucking depends on the type of behavior, its intensity, and its duration, with persistent habits more likely to cause adverse outcomes. In children aged 3 to 4 years, continued or more frequent thumb sucking may be due to changes in the child's emotional environment, and clinicians should focus on identifying the underlying issue rather than the habit itself.[8] Notably, perinatal factors such as birth weight and gestational age are not linked to prolonged sucking habits.[9] 

Overall, thumb sucking is not inherently pathological but represents a normal developmental behavior rooted in an innate need for oral stimulation and self-soothing.

Epidemiology

Nonnutritive sucking behaviors are prevalent in infancy and early childhood across various geographic areas and socioeconomic groups.[3] These behaviors are most common in infancy and decline over time, with patterns varying by age and population. A Swedish study found that up to 82% of infants display nonnutritive sucking behaviors during the first 5 months, whereas a US study reported a prevalence of around 73% among children aged 2 to 5 years.[1] By 15 months, about 60% of children engage in nonnutritive sucking, including pacifier and digit use, with over 20% specifically sucking a thumb or other digit. By 36 months, the overall prevalence decreases to approximately 40%.[10] The natural history of thumb sucking is characterized by spontaneous resolution in most children by age 4.[11] Longitudinal data show a slower decline between ages 4 and 7; approximately 4% of children continue the habit at age 8, and 2% at age 12.[12][1] Pacifier use typically decreases faster than thumb sucking, dropping from about 40% at age 1 to 1% by age 5.[12]

Several factors are linked to prolonged thumb sucking beyond early childhood. Female sex is associated with a higher prevalence, with reported ratios ranging from 1.27 to 1.47. Feeding practices also play a role: a shorter duration of breastfeeding (<12 months) has been associated with an increased risk, whereas breastfeeding for at least 12 months appears protective. Prolonged bottle feeding (≥24 months) has been associated with a 2.2- to 2.5-fold increase in the risk of persistent nonnutritive sucking habits.[9]

In addition to demographic and feeding factors, thumb sucking is also influenced by behavioral and situational factors. In preschool children, it tends to occur more often during structured routines or when they are experiencing negative emotions, further supporting its role as a self-soothing mechanism.[13]

Pathophysiology

Thumb and pacifier sucking can be characterized by their frequency, intensity, and duration, with sustained resting pressure exerting the greatest influence on tooth position. Nonnutritive sucking is generally considered a risk for malocclusion by ages 3 to 4, with more pronounced and potentially permanent effects as the permanent dentition begins to erupt. Persistence of thumb sucking beyond this stage places abnormal mechanical forces on developing oral structures, increasing the likelihood of malocclusion.[1][14][5]

History and Physical

A detailed history examines the pattern and persistence of nonnutritive sucking. Key elements include the age of onset, current frequency, duration, and intensity of the behavior, as well as contexts in which it occurs, such as during sleep, stressful periods, or throughout the day. Clinicians should also assess prior attempts at cessation and caregiver responses, as well as the feeding history, including breastfeeding and bottle-feeding, since shorter breastfeeding duration is associated with prolonged habits. Emotional stressors or recent changes in the child's environment should be explored, as thumb sucking often serves a self-soothing function.

The physical examination should focus on both the affected digit and the orofacial structures. The thumb may show callus formation or hyperkeratosis ("sucking pads"), skin maceration, eczematous changes, blisters from vigorous sucking, nail deformities, or paronychia.[15]

Oral examination may reveal characteristic dental changes associated with persistent nonnutritive sucking. These dental changes include anterior open bite, defined as a vertical gap between the upper and lower incisors when the teeth are occluded, and increased overjet, a protrusion of the upper incisors relative to the lower incisors, which occurs more frequently in thumb suckers than in pacifier users.[14][7] Additional findings include posterior crossbite due to maxillary constriction and narrowing of the maxillary arch, often resulting in a high-arched, V-shaped palate.[16] The position of the thumb may also contribute to proclination of the upper incisors, retroclination of the lower incisors, and, in some cases, delayed eruption of the incisors.[15]

Together, these findings help clinicians assess the severity of the habit and identify early complications that warrant dental referral or intervention.

Evaluation

The American Academy of Family Physicians (AAFP) recommends recognizing thumb sucking and pacifier use as normal nonnutritive sucking behaviors that promote security and self-soothing in infants. Primary care clinicians should evaluate these habits in the context of the child's age and developmental stage and perform the first oral evaluation when the first tooth erupts. They should examine the soft tissues, palate, alveolar ridges, and any erupted or erupting teeth at each well-child appointment. Once dental care is established, monitoring the developing primary dentition and occlusion should be performed at each routine visit.[5] When thumb sucking and pacifier use continue beyond age 3, the American Academy of Pediatric Dentistry (AAPD) recommends dental consultation and active discouragement of nonnutritive sucking, as these children are at a higher risk of significant dental malocclusion.[11]

Treatment / Management

Management of nonnutritive sucking depends on the child's age, the persistence of the habit, and the presence of any related problems. For primary care clinicians, the key principle is that most cases require reassurance and anticipatory guidance rather than active intervention. Most children spontaneously discontinue the habit between ages 2 and 4, and no treatment is indicated before age 2.[11] In older children, the behavior may be related to emotional stressors or environmental changes; in these cases, management should target the underlying triggers rather than just the habit itself.[8]

The American Academy of Pediatrics (AAP), the AAPD, the American Dental Association, the American Dental Hygienists' Association, and the American Association of Public Health Dentistry recommend that all children have their first dental visit by age 1. The AAPD and the AAP recommend dental evaluation and intervention for children with persistent nonnutritive sucking at age 3, or sooner if they exhibit signs of malocclusion.[17] The AAFP recommends a stepwise approach, starting with behavioral strategies and reserving more intensive interventions for cases that are resistant. Of note, both the AAFP and AAP recommend stopping pacifier use at 6 to 12 months due to an increased risk of acute and recurrent otitis media.[11][18]

First-line management involves positive reinforcement and behavioral counseling. Caregivers can reward desired behaviors (eg, periods without thumb sucking) instead of using punishment or criticism, which may increase anxiety and reinforce the habit. Habit reversal strategies—such as raising the child's awareness of the behavior and replacing it with alternative self-soothing techniques—can also be effective.[11]

Adjunctive measures, such as physical or chemical barriers (eg, thumb coverings or bitter-tasting nail preparations), can be helpful in some cases. However, they are generally not very effective for long-standing thumb sucking.[11]

When behavioral interventions fail or signs of complications emerge, primary care clinicians should refer children to a dentist or orthodontist. Custom orthodontic appliances, such as palatal cribs, bars, or similar devices, are used in refractory nonnutritive sucking cases and have been shown to increase the likelihood of habit cessation compared to no treatment.[1][5] These interventions are typically reserved for older children, especially those aged 6 or older, and for children with established dental malocclusion.[8] 

Non-orthodontic interventions for anterior open bite caused by thumb sucking include orofacial myofunctional therapy and hydrocolloid adhesive wafers. Orofacial myofunctional therapy involves exercises designed to retrain the muscles used in swallowing, speech, and maintaining proper oral posture at rest. This therapy can be combined with hydrocolloid adhesive wafers placed on the incisive papilla, covering the area where the thumb typically rests and acting as both a physical barrier and a proprioceptive cue to discourage the habit. In a 2015 study by Huang et al, children aged 4 to 12 who received a combination of adhesive wafers and myofunctional therapy showed positive results; however, further research is needed to confirm efficacy.[19]

Emerging approaches include habit-reversal devices such as electronic reminder systems. Although these approaches may be helpful in select cases, evidence remains limited, and they are not considered first-line therapy. Krishnappa et al reported a case of an 8-year-old boy with persistent thumb sucking who used a device with a wristwatch alarm that activated when he inserted his thumb in his mouth. The child was monitored for 15 months. He decreased his thumb sucking and completely stopped by 5 months. He continued wearing the device for an additional 6 months to prevent relapse.[20] A randomized clinical study by Eltager et al assessed whether a similar electronic wristwatch alarm could help children stop thumb sucking compared to a traditional orthodontic appliance (palatal crib). In this study, the palatal crib demonstrated a higher success rate in stopping the behavior. However, the difference was not statistically significant.[21]

Overall, most nonnutritive sucking behaviors can be effectively managed with reassurance, anticipatory guidance, and simple behavioral strategies. Clinicians should advise families that relapse can happen even after successful treatment, and ongoing support may be necessary to sustain cessation.

Differential Diagnosis

Thumb sucking is a normal developmental behavior and does not have a true differential diagnosis. The clinical focus is on differentiating transient, age-appropriate habits from persistent behaviors that may lead to complications and warrant intervention.

Prognosis

The prognosis of thumb sucking and other nonnutritive sucking behaviors is generally excellent. In most children, the habit resolves spontaneously during early childhood, often with minimal or no intervention.[11] When needed, cessation can typically be achieved with behavioral strategies and caregiver support, although relapse may occur even after treatment initially succeeds.

Outcomes are influenced by several factors, particularly the duration and type of habit. Prolonged behaviors are associated with a greater likelihood of persistent effects, whereas shorter-duration habits are less likely to result in lasting sequelae.[17] Thumb and digit sucking tends to have a more sustained course compared with pacifier use, which may affect the likelihood of spontaneous resolution. Protective factors, such as longer breastfeeding duration, have been associated with more favorable outcomes.[18]

The timing of habit cessation is an important determinant of prognosis. Discontinuation before the establishment of permanent dentition is associated with a higher likelihood of spontaneous normalization of oral structures.[1][22]

Overall, thumb sucking is a self-limited behavior with a favorable natural course. Prognosis is best when the habit resolves early, although effective management strategies are available for children aged 3 or older with persistent nonnutritive sucking.

Complications

The distinction between examination findings and complications is primarily based on timing, severity, and reversibility. Early changes, such as mild dental malalignment, may resolve with cessation of thumb sucking, whereas persistent or progressive changes may become permanent and require intervention.

Dental and Orofacial Complications

Malocclusion is a developmental disorder involving abnormal alignment of the teeth and jaws, resulting from both genetic and environmental influences on the craniofacial complex.[23] Children with a history of prolonged nonnutritive sucking have been reported to have a 4.25-fold higher risk of malocclusion compared with those without the behavior.[24] Children with persistent thumb sucking have a higher prevalence of anterior open bite, which may be asymmetric and more pronounced on the side of the sucking digit.[19] The presence of the thumb in the oral cavity exerts pressure on the developing dentition, disrupts normal eruption patterns, and contributes to changes such as increased overjet, posterior crossbite, and narrowing of the maxillary arch.[16]

Importantly, some dental changes may be reversible. Anterior open bite may self-correct after cessation of nonnutritive sucking, with reported rates ranging from 50% to 100%, even in children older than 4, although the certainty of evidence is low.[25] In general, malocclusion is more likely to resolve spontaneously if the habit ceases before the eruption of permanent dentition, typically by age 6. However, persistent abnormalities may require orthodontic intervention.[1]

Thumb and Skin-Related Complications

Chronic thumb sucking can result in dermatologic complications, including callus formation, hyperkeratosis, and nail deformities. Repeated exposure to moisture and mechanical trauma may disrupt the skin barrier, predisposing to infections such as paronychia.[26] In some cases, chronic irritation may lead to eczematous dermatitis. Severe or long-standing cases can result in structural deformities of the digit, which, on rare occasions, require surgical management.[1] 

Functional and Speech-Related Effects

Alterations in oral structures and tongue positioning associated with thumb sucking have been linked to atypical swallowing patterns, such as tongue thrust, which can perpetuate malocclusion even after the habit ceases. However, the claim that thumb sucking causes specific articulation disorders (difficulty with /s/, /z/, /t/, /d/, and /l/ sounds) does not appear to be well supported by recent literature. Although some older studies suggested associations, current reviews and contemporary studies indicate no clear, consistent relationship between nonnutritive sucking and speech development.[18][27][28]

Psychosocial Impact

In older children, persistent thumb sucking may lead to psychosocial consequences, including embarrassment, teasing, social interaction difficulties, and stigma. These effects may negatively impact self-esteem and social interactions, particularly as children reach school age.[1][23]

Deterrence and Patient Education

NNS habits are normal developmental behaviors in infancy that promote self-soothing and a sense of security. Most infants reduce or discontinue these behaviors on their own in infancy, although some continue into toddlerhood or beyond. Clinicians should reassure caregivers that these habits are typically benign early in life, while providing anticipatory guidance on the appropriate timing for weaning and potential complications of prolonged thumb sucking and pacifier use.

Pacifier use at sleep onset is recommended during infancy to reduce the risk of sudden infant death syndrome; however, prolonged use—particularly beyond 12 months and especially after 3 years—has been linked to an increased risk of dental malocclusion. Clinicians should advise caregivers to begin gradual weaning between 6 and 12 months of age. Many dental changes, such as anterior open bite or increased overjet, may resolve on their own if the habit stops by age 3 or 4.

Deterrence strategies should focus on supportive, nonpunitive methods. Positive reinforcement, such as praise, reward systems, or tracking thumb-free periods, is more effective and developmentally appropriate than criticism or punishment. For motivated children, habit reversal techniques (eg, increasing awareness of the behavior and replacing it with alternative self-soothing actions, such as holding a toy or a blanket) can be beneficial. Families may also consider simple barrier methods discussed earlier. For persistent behaviors, referral to dental professionals is appropriate.

Practical counseling should also address secondary complications. Chronic digit sucking can cause skin breakdown, callus formation, nail deformities, or secondary infections; preventive measures include keeping nails short and clean, using emollients or protective coverings, and monitoring for signs of irritation or infection. Additionally, if the habit persists into preschool or school age, clinicians should advise families about potential social consequences, including teasing or stigmatization by peers. Presenting cessation as a developmental milestone, involving the child in goal-setting, and enlisting supportive caregivers or teachers can help reduce embarrassment and improve adherence.

Caregivers should be encouraged to seek dental evaluation if nonnutritive sucking continues beyond age 3 or if concerns about malocclusion arise earlier. Reinforcing a supportive, developmentally appropriate approach—while balancing early benefits with long-term risks—remains the foundation of effective patient education and deterrence.

Enhancing Healthcare Team Outcomes

An interprofessional approach is crucial for improving outcomes in children with persistent nonnutritive sucking behaviors. Collaboration among pediatricians, family practitioners, physician assistants, nurse practitioners, dentists, and child behavior specialists allows for coordinated assessments, anticipatory guidance, and developmentally appropriate interventions. Clear communication among team members and caregivers helps maintain consistent messaging, reinforces positive behavior-change strategies, and prevents fragmented care. Referral to specialists should be tailored to each child's specific needs.

Dentists and orthodontists can monitor dental development and identify early malocclusion, whereas speech therapists may help with oral-motor patterns or articulation issues. Child behavioral specialists or psychologists advise families on habit reversal techniques and address underlying emotional needs. This team-based, patient-centered approach supports timely intervention, improves adherence to deterrence strategies, and fosters both functional and psychosocial well-being.

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Disclosure: Denisse Staufert Gutierrez declares no relevant financial relationships with ineligible companies.

Disclosure: Sharon Daley declares no relevant financial relationships with ineligible companies.

Disclosure: Paola Carugno declares no relevant financial relationships with ineligible companies.