How Thumb-Sucking and Pacifiers Affect Growing Smiles
Thumb-sucking and pacifier use are common during infancy and early childhood. These habits can help children feel calm, fall asleep or cope with unfamiliar situations. However, as children grow, parents may begin to wonder whether that familiar source of comfort could affect their teeth or jaw development.
The answer depends on more than whether a child uses a pacifier or sucks their thumb. How frequently the habit occurs, how forcefully the child sucks and how long the habit continues can all influence its effect on a growing smile. An occasional habit during the toddler years may not have the same impact as strong sucking that continues throughout the day and night.
Fortunately, thumb-sucking and pacifier use do not automatically lead to lasting dental problems. Many children stop on their own, and some early changes may improve after the habit ends. By monitoring your child’s development and discussing concerns during preventive dental visits, you can help protect their smile without turning the process into a source of shame or stress.
Why Thumb-Sucking and Pacifier Use Are Normal
Babies are born with a natural sucking reflex that helps them feed and find comfort. Some infants begin sucking their fingers or thumbs before birth, while others become attached to a pacifier during their first months of life. The soothing effect can help children regulate their emotions when they are tired, anxious, overstimulated or separated from a caregiver.
Dentists may refer to thumb-sucking, finger-sucking and pacifier use as “nonnutritive sucking.” This simply means that a child is sucking for comfort rather than to receive milk or other nutrition. These behaviors are generally considered normal during infancy and early childhood.
The presence of an oral habit alone does not determine whether dental changes will develop. Pediatric dentists look at the habit’s duration, frequency and intensity, sometimes called the three factors of “how long, how often and how strongly.” They may also consider how a child positions their thumb, finger or pacifier and whether visible changes are already developing.
Understanding that these habits serve a real emotional purpose can help families approach them with patience. The goal is not to make children feel that they have done something wrong. Instead, parents and pediatric dentists can work together to gradually replace the habit with other sources of comfort as the child becomes developmentally ready.
Does Thumb Sucking Affect Teeth?
Thumb-sucking can affect teeth when the habit continues frequently or intensely over time. Prolonged sucking may contribute to an open bite, protruding front teeth, a crossbite or changes in the shape of the dental arches. Many early changes improve after the habit stops, especially when children quit before their permanent teeth begin erupting.
The pressure created by sucking can influence the position of developing and erupting teeth. It may also affect the balance of pressure from the tongue, lips and cheeks, all of which help guide the development of the mouth. According to the American Academy of Pediatric Dentistry, prolonged nonnutritive sucking habits have been associated with changes such as increased overjet, anterior open bite and posterior crossbite.
Not every child who sucks their thumb will develop the same concerns. A child who briefly sucks their thumb while falling asleep may experience less pressure than a child who maintains a strong habit for hours at a time. Genetics, facial growth, breathing patterns and tongue position can also contribute to how the teeth and jaws develop.
How Oral Habits Can Change a Child’s Bite
A child’s “bite,” also called their occlusion, describes how the upper and lower teeth fit together when the mouth closes. Ideally, the teeth should meet in a way that allows the child to bite, chew and speak comfortably. Repeated pressure from a thumb, finger or pacifier may influence this relationship while the mouth is still developing.
Some children show no visible changes, while others develop one or more bite differences. The type and severity of those changes can depend on the habit and the child’s individual growth pattern.
Anterior Open Bite
An anterior open bite occurs when the back teeth come together but the upper and lower front teeth do not meet. There may be a visible opening between the front teeth even when the child closes their mouth completely. This is one of the bite changes commonly associated with prolonged pacifier use or thumb-sucking.
An open bite may make it more difficult for a child to bite through certain foods with their front teeth. Depending on its severity and other developmental factors, it may also contribute to difficulty producing certain speech sounds. However, speech differences have many possible causes, so children should be evaluated individually rather than assuming an oral habit is solely responsible.
Protruding Front Teeth and Increased Overjet
Repeated pressure from a thumb or finger may push the upper front teeth outward. Dentists use the term “overjet” to describe the horizontal distance between the upper and lower front teeth. When that distance becomes greater than expected, the upper teeth may appear to project forward.
More prominent front teeth may be exposed to a greater risk of injury during falls, sports or playground collisions. The lower front teeth may also tilt inward depending on how the child positions their thumb. Because these changes can develop gradually, parents may not immediately notice them without regular growth and development monitoring.
Posterior Crossbite
A posterior crossbite occurs when some of the upper back teeth sit inside the lower back teeth rather than slightly outside them. Prolonged sucking can affect the width and shape of the upper dental arch, which may contribute to this uneven relationship. A crossbite can affect one side or both sides of the mouth.
Posterior crossbites may not be as noticeable to parents as changes involving the front teeth. During a dental examination, the pediatric dentist can evaluate how the back teeth fit together and whether the lower jaw shifts when the child closes their mouth. Early monitoring helps the dentist determine whether a change may improve with growth or should receive additional attention.
Changes to the Roof of the Mouth and Jaw Growth
Long-term oral habits may also influence the palate, or roof of the mouth, and the shape of the dental arches. Constant pressure can contribute to a narrower upper arch or changes in how the upper and lower jaws relate to one another. The American Dental Association notes that prolonged sucking can affect the proper growth of the mouth, the alignment of the teeth and the roof of the mouth.
It is important to remember that oral habits are only one part of a child’s development. Genetics, airway concerns, mouth breathing, tongue posture and natural growth patterns can also affect the teeth and jaws. A pediatric dentist can consider these factors together rather than attributing every change to thumb-sucking or pacifier use.
Thumb-Sucking vs. Pacifiers: Is One Better for Teeth?
Thumbs and pacifiers can affect the teeth in similar ways when sucking continues frequently or intensely over a long period. Either habit may contribute to an open bite, changes in overjet or differences in the dental arches. The most important factors are usually the duration and strength of the habit rather than the object being used.
However, pacifiers offer one practical advantage: Parents can control when they are available and eventually remove them. A thumb is always accessible, which can make a deeply established thumb-sucking habit more difficult to stop. Finger habits also may be associated with more pronounced forward movement of the upper front teeth in some children.
Some pacifiers are marketed as “orthodontic” because their nipples have a different shape. Although the shape may distribute pressure differently, no pacifier can guarantee that dental changes will not occur with prolonged use. An orthodontic label should not be viewed as a reason to continue the habit indefinitely.
If your child needs a pacifier for comfort, focus on gradually limiting how often it is used as they grow. Avoid dipping it in honey, sugar or another sweet substance, which can increase the risk of tooth decay. Your pediatric dentist can help you create an age-appropriate plan based on your child’s habits and development.
When Should Children Stop Thumb-Sucking or Pacifier Use?
The AAPD recommends helping children discontinue nonnutritive sucking habits by age 3 or earlier. Its current policy on pacifiers also explains that pacifier use beyond 18 months can begin to influence the developing mouth and jaws. This does not mean every child must stop suddenly at 18 months, but it is a helpful time to begin reducing reliance on the pacifier.
Parents might start by limiting pacifier use to naps and bedtime rather than allowing it throughout the day. As the child becomes comfortable with that change, the family can gradually reduce its use during sleep routines. Beginning the process early allows children time to adjust before the habit becomes more firmly established.
Thumb-sucking may require a different approach because parents cannot simply remove the thumb. Paying attention to when the habit occurs can help identify the need it is meeting. A child who sucks their thumb when tired may respond to a more consistent bedtime routine, while a child who uses it during stressful moments may benefit from reassurance or another calming activity.
Age is important, but it is not the only consideration. Talk to your child’s pediatric dentist sooner if the habit is especially forceful, continues for much of the day and night or appears to be changing the bite. Individual guidance can help you decide when and how to intervene.
Will the Teeth Move Back After the Habit Stops?
Some early dental changes may improve naturally after thumb-sucking or pacifier use ends. Baby teeth can shift, and the developing mouth may continue to change as the child grows. An open bite associated with a sucking habit, for example, may become smaller once the pressure is removed.
However, self-correction is not guaranteed. More significant bite differences, posterior crossbites or changes involving the jaws may persist after the habit stops. The likelihood of improvement depends on the type and severity of the change, when the habit ended and the child’s remaining growth.
This is one reason it is helpful to address oral habits before permanent teeth begin erupting. A pediatric dentist can document your child’s bite, monitor changes over time and recommend an orthodontic evaluation when appropriate. An evaluation does not automatically mean your child will need treatment; it may simply provide more information about their development.
Gentle Ways to Help Your Child Stop
Stopping a comforting habit is a process, and children are more likely to succeed when they feel supported. Begin by noticing when your child reaches for their thumb or pacifier and what may be triggering the behavior. Tiredness, boredom, anxiety and changes in routine are all common triggers.
Families can then introduce alternatives that meet the same need. A favorite stuffed animal, calming music, a bedtime story or a reassuring hug may help a child settle without sucking. Praise small successes, such as going through an activity or part of the bedtime routine without the habit.
Gradual limits may feel more manageable than an abrupt change. You might designate certain times or places as pacifier-free, use a simple reward chart or invite an older child to choose a date for saying goodbye to the pacifier. Children who are involved in the plan often feel a greater sense of control.
Avoid teasing, scolding, punishing or calling attention to the habit in front of other people. Shame can increase stress and make the child more dependent on the behavior for comfort. Reminder devices or dental appliances may be appropriate in select situations, but they should only be considered with professional guidance.
When to Talk to a Pediatric Dentist
You do not need to wait until a dental change becomes severe to ask for help. Your child’s preventive visits are a natural opportunity to discuss oral habits and receive recommendations based on their age, bite and emotional readiness.
Consider talking to a pediatric dentist if:
The habit continues near or beyond age 3.
Your child sucks their thumb or uses a pacifier frequently during the day and night.
The front teeth no longer meet when your child closes their mouth.
The upper front teeth appear to project forward.
The back teeth fit together unevenly.
Your child has difficulty biting into food.
You notice speech concerns, mouth breathing or changes in jaw alignment.
Your child wants to stop but is struggling.
Even if you are unsure whether anything has changed, it is OK to ask. Early conversations can provide reassurance, prevent unnecessary worry and make it easier to address concerns before permanent teeth arrive.
Parent FAQs
At What Age Does Thumb Sucking Affect Teeth?
There is no single age when thumb-sucking begins to affect every child’s teeth. Changes depend on how frequently, forcefully and persistently the child sucks their thumb, along with their individual growth pattern. Families should generally work toward stopping by age 3 and consult a pediatric dentist sooner if visible bite changes are developing.
Are Pacifier Teeth Permanent?
Some dental changes associated with pacifier use may improve after the habit stops, especially when the child is young and the changes involve baby teeth. More pronounced bite or jaw changes may not fully correct on their own. A pediatric dentist can monitor the child’s development and explain whether additional evaluation is needed.
Is an Orthodontic Pacifier Better for Dental Development?
An orthodontic pacifier has a nipple designed to distribute pressure differently than a conventional pacifier. Some designs may affect the mouth differently, but no pacifier eliminates the possibility of bite changes when use continues for an extended period. How long and how often the child uses the pacifier remains important.
Can Thumb-Sucking Affect Speech?
Prolonged thumb-sucking may contribute to bite or tongue-position changes that influence certain speech sounds. However, speech concerns can have several causes and should be evaluated individually. Your child’s dentist, pediatrician or speech-language pathologist can help determine the appropriate next step.
Does My Child Need an Orthodontic Evaluation?
Not every child who uses a pacifier or sucks their thumb will need orthodontic care. A pediatric dentist can monitor the bite as your child grows and recommend an orthodontic evaluation if a change appears unlikely to correct naturally. Early evaluation may help the dental team understand your child’s growth, even when no immediate treatment is recommended.
Supporting Healthy Growth One Step at a Time
Thumb-sucking and pacifier use are normal parts of early childhood for many families. They provide comfort during a stage when children are still learning how to manage big feelings, unfamiliar experiences and changing routines. Having one of these habits does not mean your child is destined to experience lasting thumb sucking teeth problems.
The best approach is usually calm, gradual and tailored to the individual child. By reducing the habit at an appropriate age, avoiding shame and keeping up with regular dental visits, families can support healthy oral development while respecting the emotional purpose the habit serves.
If your child still uses a pacifier or sucks their thumb and you have questions about their bite, the team at Midtown Pediatric Dentistry can help. Schedule a visit for personalized guidance and support as your child’s smile grows.
