Thumb sucking is a natural reflex that helps babies and young children feel safe, comforted, and secure. In fact, many children begin sucking their thumb before they’re even born. While this habit is perfectly normal during infancy and early childhood, prolonged thumb sucking can have an impact on the way your child’s teeth and jaws develop.
So, when does thumb sucking become a concern, and what can parents do to help?
Why Do Children Suck Their Thumb?
Thumb sucking is a common self-soothing habit. Children may suck their thumb when they are:
- Feeling tired or ready for sleep
- Anxious or overwhelmed
- Bored
- Seeking comfort in unfamiliar situations
For many children, the habit naturally fades between the ages of 2 and 4 without any intervention.
When Can Thumb Sucking Affect Teeth?
Most dental professionals agree that thumb sucking is unlikely to cause permanent problems if it stops before the permanent teeth begin to erupt, usually around the age of 5 or 6.
However, if thumb sucking continues beyond this age—or if the habit is particularly frequent or vigorous—it can begin to influence the growth of the teeth, jaws, and bite.
The amount of pressure placed on the teeth matters just as much as how often the thumb is sucked. Gentle, occasional thumb sucking is generally less likely to cause issues than vigorous sucking for long periods. Sometimes children may not use just their thumb but other digits / fingers as well. These all have the same consequences as the thumb.
How Thumb Sucking Can Impact Teeth Development
- Protruding Front Teeth
One of the most common effects is the upper front teeth being pushed forwards while the lower front teeth may tilt backwards. This can create an increased overjet, sometimes referred to as “buck teeth.”
- An Open Bite
Persistent thumb sucking can prevent the upper and lower front teeth from meeting when the mouth is closed. This is known as an open bite.
Children with an open bite may find it more difficult to bite into foods and may also develop speech difficulties with certain sounds.
- Changes to Jaw Growth
The constant pressure from thumb sucking can influence the way the upper jaw develops, sometimes leading to a narrower upper arch.
This may contribute to crossbites, where the upper teeth bite inside the lower teeth instead of outside, because the upper jaw is narrower.
- Speech Development
Changes in tooth position and bite can sometimes affect speech, particularly sounds such as “s,” “z,” and “th.” While not every child experiences speech difficulties, correcting the underlying bite can often help improve pronunciation.
Can the Teeth Correct Themselves?
If a child stops thumb sucking while they are still growing, some minor changes may improve naturally as the jaws continue to develop.
However, if the habit continues after the permanent teeth begin erupting, the changes are less likely to resolve on their own and orthodontic treatment may eventually be needed.
Early assessment allows us to monitor development and determine whether intervention is necessary.
Helping Your Child Stop Thumb Sucking
Breaking the habit isn’t always easy, especially if thumb sucking has become a source of comfort.
Here are some gentle strategies that may help:
- Praise and reward your child for not sucking their thumb rather than focusing on punishment.
- Identify situations where they are most likely to suck their thumb, such as watching television or going to bed, and offer alternative comfort methods.
- Use reminder techniques, such as a bandage, thumb guard, or foul tasting nail varnish such as “stop and grow”, if your child is motivated to stop. It is important to explain this is being used as a reminder not a punishment. Placing a sock on the hand and gently securing it is also and easy and low intervention technique.
- Be patient and supportive—many children simply need time.
Avoid scolding or shaming your child, as this can increase anxiety and actually reinforce the habit.
When Should You See an Orthodontist?
You don’t need to wait until all the permanent teeth have erupted to have your child’s bite assessed.
At Toowong Orthodontics, we recommend an orthodontic assessment around the age of 7-9. This allows us to monitor jaw growth, identify any developing bite concerns, and determine whether thumb sucking has had any lasting effects.
We can also provide a thumb sucking deterrent that is bonded to the teeth. These are very effective particularly if the child is motivated to stop the habit but just needs some help.
Even if treatment isn’t needed immediately, early monitoring provides peace of mind and helps ensure your child’s smile develops as expected.
How We Can Help
Every child develops differently. If your child is still sucking their thumb or you’ve noticed changes in the way their teeth fit together, our team is here to help.
We’ll carefully assess your child’s teeth, jaws, and facial development, explain what we’re seeing, and discuss whether monitoring or treatment is recommended. In many cases, early guidance can prevent more complex orthodontic issues later on.
If you have concerns about your child’s thumb sucking habit or their developing bite, we’d be happy to help.
Contact Toowong Orthodontics to arrange a consultation with one of our specialist orthodontists. Early advice can make a significant difference in supporting healthy smile development.
07 3870 0922 or Contact Us
