What Are the Effects of Finger Sucking on the Teeth and Mouth?

Finger sucking is a natural and comforting habit for many children — but when it continues for several years, especially with strong sucking pressure, it can begin to effect the teeth, jaw and mouth. Understanding what’s normal, what may cause problems, and how to help your child stop can make the journey much easier for everyone.

Effects of finger sucking on the Mouth

Finger sucking begins as a soothing reflex, often starting before birth. For many children, it fades naturally between ages 2 and 4. However, persistent or vigorous sucking can place repeated pressure on the teeth, jawbone and roof of the mouth.

This may lead to:

• Overbite — where the upper front teeth begin to protrude
• Open bite — when the top and bottom teeth don’t meet when the mouth is closed
• Changes in jaw shape — which may influence tooth alignment and even speech sounds
• Sensitivity of the palate — caused by constant pressure on the roof of the mouth

Not all children who suck their fingers develop these issues. Passive sucking (simply resting the fingers in the mouth) is far less likely to cause changes. Most early effects of finger sucking on baby teeth also improve once permanent teeth begin to come through — as long as the habit has stopped.

Seeking Help

Regular dental check‑ups from age 1 are recommended for all children. If you notice:

• Front teeth beginning to tilt forward
• A bite that doesn’t seem to meet properly
• Speech changes such as a developing lisp
• Ongoing, vigorous finger sucking

…it’s worth speaking to a paediatric dentist. They can assess whether the habit is affecting your child’s mouth and offer guidance on next steps.

Even though permanent teeth don’t appear until around age 6, changes to the mouth can happen earlier — so early reassurance and advice can be helpful.

When should I help them to stop?

Most children naturally stop finger sucking between ages 2 and 4. If your child continues beyond age 4, especially during the day or with strong sucking pressure, it may increase the likelihood of dental changes.

A paediatrician or dentist may suggest:

• Monitoring the habit for a little longer
• Introducing gentle strategies to help your child stop
• Using supportive tools such as a fabric finger guard

Every child is different, and the right approach depends on their age, temperament and reasons for sucking.

Tips to Help Your Child Stop Finger Sucking

Children are far more successful when they want to stop, so encouragement works better than pressure. Here are supportive strategies that can help:

Identify triggers

Finger sucking often appears when a child is:

• Tired
• Bored
• Anxious
• Hungry
• Seeking comfort

Understanding why they suck can help you redirect the behaviour — for example, offering a cuddle, a snack, or a hands‑on activity like drawing or building.

Use positive reinforcement

Praise small wins. Sticker charts, reward jars or simple verbal encouragement can make a big difference.

Talk to your child

Older children often respond well to gentle explanations or pictures showing how finger sucking can affect their teeth.

Ask your dentist for support

A dentist’s reassurance can be powerful — many children take advice more seriously when it comes from a professional.

Try a finger guard

If you notice the effects of finger sucking is having on your child’s mouth then try a fabric finger glove. Soft, comfortable finger guards act as a gentle reminder not to suck. Thumbsie® finger guards are made from fabric, available in five sizes, and come in fun, child‑friendly designs that children enjoy choosing. They can be worn during the day, at night, or whenever your child is most likely to suck.

Why Do Children Suck Their Fingers?

Finger sucking is a soothing, instinctive behaviour that begins in the womb. Babies often continue the habit because it helps them relax and fall asleep. For toddlers, it can become a coping mechanism during moments of stress, tiredness or overwhelm.

According to the American Dental Association, most children stop naturally between ages 2 and 4 — but some need a little extra support.

Conclusion

Finger sucking is a normal, comforting habit for many children, and in most cases it resolves on its own. However, if it continues past age 4 or involves strong sucking pressure, it can begin to affect the teeth, jaw and mouth.

With gentle encouragement, positive reinforcement and supportive tools like a Thumbsie® finger guard, many children can break the habit confidently and successfully.