Sep 30, 2026

Thumb Sucking and Dummies: How Can They Affect Your Child’s Teeth?

OHDP Team

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A simple guide for parents from Oswyn House Dental Practice.

Thumb sucking and dummy use are perfectly normal during early childhood. They provide comfort and reassurance, particularly when children are tired, anxious or settling down to sleep.

Most children naturally grow out of these habits. However, if they continue for too long, they can affect how children’s teeth and jaws develop.

Here’s what parents need to know, based on guidance from the British Orthodontic Society (BOS) and NHS.

1. Why do children suck their thumbs?

Babies are born with a natural sucking reflex. As they grow, thumb sucking or dummy use can become a comforting habit.

According to the British Orthodontic Society, most children stop by around four years of age. However, approximately one in eight children aged 7–11 continues sucking their thumb or fingers.

The habit is particularly common when children are tired, bored or seeking reassurance.

2. Can thumb sucking affect children’s teeth?

Yes. Prolonged thumb sucking or dummy use can cause:

  • Protruding front teeth: The upper front teeth begin to stick forwards.
  • Open bite: A gap develops between the upper and lower front teeth when biting together.
  • Crossbite: The upper jaw becomes narrower, causing the back teeth to meet incorrectly.
  • Speech difficulties: Frequent sucking habits may affect speech development.

The effects depend on how often, how forcefully and for how long the child sucks their thumb.

The BOS advises that sucking for more than six hours a day or night increases the likelihood of dental problems.  

3. When should children stop?

Dummy use: The NHS recommends aiming to stop using dummies by approximately 12 months of age.

Thumb sucking: Most children stop naturally, but parents should encourage them to break the habit before their permanent front teeth emerge.

The BOS advises that:

  • Stopping early reduces the risk of dental problems.
  • If the habit stops before approximately age seven, some changes in tooth position may correct themselves.
  • Continuing beyond seven increases the likelihood of lasting dental changes that may require orthodontic treatment.

The sooner the habit stops, the better the chance of avoiding long-term problems.  

4. How can you help your child stop thumb sucking?

Breaking a habit can be difficult, particularly when it provides comfort. The British Orthodontic Society recommends a positive, supportive approach.

Here are seven practical strategies to help.

  • Encourage rather than criticise

Explain gently why stopping is important. Avoid nagging, teasing, punishing or embarrassing your child.

  • Use a reward chart

Create a colourful sticker chart and reward your child for periods without thumb sucking. Small daily achievements can build motivation.

  • Praise their progress

Recognise when your child manages without sucking their thumb. Positive encouragement helps build confidence.

  • Identify when the habit happens

Notice whether your child sucks their thumb when tired, bored or anxious. Offer alternative comfort, such as a favourite toy, cuddle or bedtime story.

  • Try gentle physical reminders

For children who want to stop, the BOS suggests reminders such as:

  • A sticky plaster or bandage.
  • A cotton glove or sock.
  • A suitable thumb guard.
  • Bitter-tasting nail varnish designed for discouraging nail biting or thumb sucking.

Choose age-appropriate, safe options and use them with your child’s cooperation.

  • Tackle daytime habits first

Children often stop sucking their thumbs during the day before managing to stop at night. Celebrate daytime progress rather than expecting immediate success.

  • Involve your child

Most importantly, your child needs to want to stop. Talk to them about what might help and involve them in choosing rewards and reminders.

Patience and encouragement are far more helpful than pressure.  

5. Are dummies better than thumb sucking?

Both habits can affect developing teeth.

However, the BOS explains that dummy habits are generally easier to stop because parents can gradually remove the dummy. Thumb sucking can be more persistent because the thumb is always available.

The NHS recommends:

  • Gradually reducing dummy use, initially limiting it to sleep times.
  • Removing dummies when children are babbling or talking.
  • Never dipping dummies in honey, sugar or other sweet substances.
  • Never cleaning a dummy by putting it in your own mouth, as this can transfer germs.

For children struggling to give up their dummy, cuddles, stories, favourite toys and gradually reducing access may help.  

6. Will the teeth straighten naturally?

Often, some improvement occurs once the habit stops, particularly in younger children whose teeth and jaws are still developing.

However, if the habit continues beyond approximately seven years of age, changes may become more difficult to correct naturally.

Some children may eventually require orthodontic treatment.

For particularly persistent habits, a dentist or orthodontist may recommend a habit-breaking dental appliance to help the child stop.

Orthodontic treatment is generally best undertaken once the sucking habit has stopped.

7. When should you speak to your dentist?

We recommend arranging a dental assessment if:

  • Your child continues regularly sucking their thumb as they approach school age.
  • Their upper front teeth begin sticking out.
  • A gap appears between their front teeth when biting.
  • You notice changes in how their teeth meet.
  • Your child is struggling to break the habit.

Early advice can help prevent more complicated problems later.

Helping Little Smiles Grow at Oswyn House

At Oswyn House Dental Practice, we understand that thumb sucking is often an important source of comfort for children.

Our approach is gentle, supportive and focused on prevention.

We can assess your child’s developing teeth, identify any concerns and offer practical advice to help them break the habit.

Remember, a little encouragement today can make a big difference to your child’s smile tomorrow.

Oswyn House Dental Practice

20 Oswald Road, Oswestry, SY11 1RE

Telephone: 01691 652424

Website: www.ohdp.co.uk

Written or reviewed by Jabbar Hussain. Dentist with over 20 years’ experience in high-end general and cosmetic dentistry.


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