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This habit makes them feel safe and relaxes them especially when they are in unfamiliar surroundings, when they are tired or when they are sleeping. However, prolonged thumb sucking can cause problems related to the proper development of the jaws and the correct distribution of teeth in the dental barrier.
These problems can be either the abnormal protrusion of the upper jaw and its teeth (prognathism) or the existence of a gap between the front teeth when the child closes the mouth. Of course, it should be noted that if the child stops the harmful habit, the damage usually largely repairs itself. But when the child continues beyond the age of 4 years then parents should help the child to break the habit. However, too much pressure can do more harm than good.