Paediatric Dentistry
Thumb & dummy sucking
Thumb and dummy sucking is normal early on but is best stopped by about age three.
Normal until
About age 3
Most stop
On their own
If it lasts
May affect bite
Approach
Gentle support
Overview
Sucking a thumb or dummy comforts young children and is completely normal in the first years. Most children stop on their own.
If the habit continues past about age three, it can start to change how the teeth and jaws grow. Gentle encouragement to stop is then helpful.
What to know
- Normal and comforting in early years
- Most children stop by themselves
- Best stopped by about age three
- Long habits can affect the bite
Common questions
Is thumb sucking harmful?
Not in the early years. It is only a concern if it continues as the adult teeth come in.
Thumb or dummy, which is worse?
A dummy habit is often easier to stop because you can phase the dummy out.
How can I help my child stop?
Praise and gentle reminders work better than telling off. Your dentist can suggest more.
When should I worry?
If sucking continues past about age three or you notice the front teeth changing.
Related topics
Your child's first visit
An early, friendly first visit helps your child feel at ease at the dentist.
Bite problems (malocclusion)
When upper and lower teeth do not meet the way they ideally should.
Crowded & crooked teeth
When teeth overlap or twist because there is not enough room in the jaw.
Teething
Teething is the normal, temporary discomfort as baby teeth come through.
Dr Rick Iskandar · Reviewed June 2026