Babies have a natural inclination to put just about anything in their mouths, some even suck their thumbs before they’re born. A thumb or soother is a natural way for little ones to self-soothe, and in the early years it’s nothing to worry about.
But, like most habits babies have, it has a life span. Knowing when it’s ok and when to step in is important for parents.
How sucking habits affect teeth
A thumb or soother pressing on the teeth and roof of the mouth for hours at a time can gradually change how the mouth develops. Long-term habits can lead to:
- Upper front teeth that tip forward
- An open bite, where the front teeth don’t meet when the back teeth close
- A narrower upper jaw, which can cause a crossbite
Intensity matters too. A child who gently sucks a thumb while drifting off to sleep is at lower risk than one who sucks hard throughout the day.
When to start weaning
Most kids drop the habit on their own between ages 2 and 4. The Canadian Paediatric Society recommends ending soother use before age 3 or 4, though earlier is fine. For thumb sucking, it’s worth stepping in if the habit continues past age 4, before adult teeth start arriving.
soothers have one advantage: you can take them away. Thumbs are harder to put in a drawer.
Tips for breaking the habit
- Praise thumb-free and soother-free days, or try a sticker chart
- Watch for triggers like boredom, stress or tiredness and offer comfort another way
- Limit soothers to naps and bedtime before phasing them out
- Never dip a soother in sugar, honey or juice
Keep things positive — scolding tends to backfire.
What if teeth have already shifted?
Mild changes to baby teeth often correct themselves once the habit stops. If bite problems carry over into the adult teeth, teeth straightening with clear aligners can correct many mild to moderate issues, including open bites and overbites.
Regular checkups let your dentist keep an eye on your child’s teeth and jaw as they develop, so any concerns are caught early.