Published October 18, 2026
A pediatric dentist in Lowell or family dentist can check how the bite is developing at regular visits.
Why children suck thumbs and pacifiers
Sucking is a natural reflex. Many babies suck thumbs, fingers or pacifiers to soothe themselves, and it often helps them fall asleep. Most children stop on their own, often between ages two and four.
When it may affect teeth
A long-lasting, intense habit can affect how teeth and jaws develop. Possible effects include upper front teeth that tip forward, an open bite where front teeth do not meet, and changes in the roof of the mouth. The AAPD encourages parents to discuss habits with a dentist and generally supports helping children stop by about age three. Passive thumb resting is less of a concern than vigorous sucking.
Pacifier tips
- Never dip a pacifier in honey, sugar or juice
- Avoid cleaning a pacifier in your own mouth, which can pass bacteria
- Choose a one-piece, age-appropriate pacifier and replace worn ones
- Never tie a pacifier around a baby’s neck
Gentle ways to help a child stop
Pressure and scolding usually backfire. Gentler approaches tend to work better:
- Praise times when your child is not sucking rather than criticizing when they are
- Notice triggers, such as tiredness or boredom, and offer another comfort
- Use a sticker chart or small non-food rewards for older preschoolers
- For pacifiers, try cutting back to bedtime only before stopping completely
- Let the dentist explain to an older child why stopping helps
When to talk with a dentist
Mention the habit at checkups. If it continues as permanent front teeth come in, typically around age six, or if you notice changes in the bite, ask a dentist about next steps. In some cases a dentist may refer to an orthodontist or discuss a habit appliance.
Questions parents ask
Is a pacifier better than a thumb?
Both can affect teeth if they continue for years. A pacifier can be taken away gradually, which some parents find easier.
Will my child’s teeth fix themselves after stopping?
Some changes can improve after the habit stops, especially if it stops before permanent teeth come in. A dentist can monitor.
Should I use bitter nail polish?
Some families try it for older children who want to stop. Ask your dentist or pediatrician first, and pair it with positive support.
My child sucks only at night. Is that a problem?
It is less intense than all-day sucking, but long-term nighttime habits can still affect teeth. Mention it at checkups.
Official sources for further reading
Written independently for this site. These organizations publish their own guidance; they did not review or endorse this page.