Sucking on a thumb, fingers or a pacifier is one of the first ways babies comfort themselves. For most young children it is completely normal. Parents often wonder when the habit starts to matter for teeth, and how to help a child stop without turning it into a battle. This guide covers what the American Dental Association (ADA) says about thumb sucking and pacifiers, the signs worth mentioning to a dentist, and gentle ways to help a child move on.
Why children suck their thumbs
The ADA describes thumb sucking as a natural reflex for children. Sucking on thumbs, fingers, pacifiers or other objects may help babies feel secure and happy and help them learn about their world. Young children may also suck to soothe themselves and fall asleep.
Because the habit is tied to comfort, children often suck their thumbs more when they are tired, anxious, bored or unwell. That is useful to know when you try to help them stop.
How it can affect teeth
According to the ADA, once permanent teeth come in, sucking may cause problems with the proper growth of the mouth and the alignment of the teeth. It can also change the roof of the mouth. Some aggressive thumb suckers may develop problems with their baby (primary) teeth as well.
Intensity matters
The ADA says the intensity of sucking helps determine whether dental problems result. Children who rest a thumb passively in the mouth are less likely to have problems than those who suck vigorously. A child who barely moves their thumb at bedtime is in a different situation from one whose sucking you can hear across the room.
Pacifiers
The ADA says pacifiers can affect teeth in essentially the same ways as sucking fingers and thumbs, but the pacifier habit is often easier to break. A parent can take a pacifier away. A thumb is always there.
When children usually stop
The ADA says children usually stop sucking between ages 2 and 4, or by the time the permanent front teeth are ready to erupt. Our baby teeth timeline explains roughly when teeth come in and fall out, based on the ADA’s eruption charts.
If you notice changes in your child’s baby teeth, or you are concerned about the habit, the ADA recommends consulting your dentist.
Signs worth mentioning to your dentist
- Sucking continues as the permanent front teeth are getting ready to come in
- Vigorous sucking, especially if you can hear it or see calluses on the thumb
- Changes you can see in how the front teeth sit or meet
- Your child wants help stopping but is struggling
Your dentist can look at how the teeth and jaws are developing. If alignment is a concern, they may suggest an orthodontic evaluation. Our article on when kids should see an orthodontist explains what that early check involves.
How to help your child stop
The ADA’s tips focus on encouragement rather than punishment:
Praise, do not scold
Praise your child for not sucking. Positive attention for the times they do not suck tends to work better than pointing out the times they do.
Address the reason behind it
Children often suck their thumbs when they feel insecure or need comfort. The ADA suggests focusing on the cause of the anxiety and comforting your child. If the habit spikes at bedtime, a calmer routine, a favorite stuffed animal or extra cuddles might help.
Let older children help choose the method
For an older child, the ADA suggests involving them in choosing how to stop. Kids are more likely to stick with a plan they helped make, such as a sticker chart or a small reward after a week.
Let the dentist help
The ADA notes that a dentist can encourage your child and explain what could happen to their teeth if they do not stop. Hearing it from someone other than a parent sometimes makes a difference.
Gentle reminders at night
If those tips do not work, the ADA suggests reminding the child of the habit by bandaging the thumb or putting a sock on the hand at night.
Professional options
The ADA says your dentist or pediatrician may prescribe a bitter medication to coat the thumb, or a mouth appliance. These are steps to discuss with a professional, not things to improvise.
A step-by-step plan
- Watch first. For a week, note when your child sucks a thumb or pacifier: bedtime, car rides, screen time or stressful moments.
- Talk about it. With an older child, agree on the goal together and let them help choose the method, as the ADA suggests.
- Offer substitutes for comfort. A hug, a comfort object or a calming routine for the times the habit shows up most.
- Praise success. Celebrate thumb-free stretches. A sticker chart works for many families.
- Add gentle night reminders if needed, such as a bandage or sock on the hand.
- Bring in the dentist for encouragement, or to discuss a bitter coating or appliance if the habit persists.
What tends to backfire
Because the habit is often a response to stress or a need for comfort, shaming or scolding can raise a child’s anxiety and make the habit harder to drop. The ADA’s tips point the other way, toward praise, comfort and involving the child. Expect setbacks during illness, travel or big changes such as a new sibling or school, and simply restart the plan.
Weaning off a pacifier
Since the ADA notes that the pacifier habit is often easier to break, many of the same principles apply. Use praise, provide other comfort, and involve older toddlers in the plan. Some families reduce pacifier use to sleep times first, then phase it out. Ask your child’s dentist or pediatrician what fits your child’s age.
Choosing the right dentist for young kids
A dentist who regularly sees young children can spot early changes and talk to your child in a way they understand. Our comparison of a pediatric dentist vs a general dentist can help you decide, and you can search for a dentist near you.
Frequently asked questions
Is thumb sucking bad for baby teeth?
The ADA says problems are more likely after permanent teeth come in. Some aggressive thumb suckers can develop problems with baby teeth too. Gentle, passive sucking is less likely to cause problems.
At what age should my child stop?
The ADA says children usually stop between ages 2 and 4, or by the time the permanent front teeth are ready to erupt. Talk to your dentist if the habit continues or you see changes in the teeth.
Is a pacifier better than a thumb?
According to the ADA, pacifiers affect teeth in essentially the same ways, but the habit is often easier to break.
Should I punish my child for thumb sucking?
The ADA recommends praise for not sucking and comfort for the anxiety that may drive the habit, rather than punishment.
What if nothing works?
The ADA suggests night-time reminders such as a bandage or sock. If those do not work, your dentist or pediatrician may prescribe a bitter coating or a mouth appliance.
Sources
By the Dentist Review Editorial Team.
This article is for general information only and is not medical advice. Talk to a licensed dentist about your own situation. See our disclaimer.
Featured image: “Bamboo Pacifiers” by Orwild, via Wikimedia Commons, licensed CC BY-SA 4.0. Resized and compressed for the web.
Our guides are written and reviewed by the Dentist Review editorial team. We research each topic using public, authoritative sources such as the CDC, the National Institutes of Health (NIH/NIDCR), the American Dental Association (ADA) and CMS, and we update guides when guidance changes. Guides are for general information only and are not dental or medical advice; please read our disclaimer and learn more about us.