Experts agree that sucking a thumb is a natural reflex for children, a habit that some individuals may even begin while they are still in the womb.
Many youngsters continue sucking their thumb until they are toddlers, with most stopping between the ages of two and four without suffering any lasting dental problems.
However, some parents may still be worried about whether their child is damaging their teeth and mouth development by sucking their thumb.
The American Dental Association says that parents should not be overly concerned with thumb-sucking until a child’s permanent teeth begin to grow in – unless they are particularly vigorous with their sucking, which may cause problems with baby teeth.
As permanent teeth emerge, the ADA advises parents to discourage the habit. Thumb-sucking can lead to problems with the growth of the jaw, mouth and palate. It can also affect the alignment of teeth, causing the upper front teeth to protrude.
Parents who want to help their children break the habit may wish to ask their dentist to explain the potential consequences for their dental health.
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