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Thumb of finger

Thumb or finger sucking in young children usually stops at the age of 2-3, in which case any minor damage done is self-cured without any intervention. A child who continues after that age even through the school years, can be concealing some kind of insecurity or stress that can be due to several reasons such as a younger sibling, long absence of the parents or a change of school or house.
In these cases support, affection, friendly conversation are the best assistance to eradicate the problem in its source. In persistent cases the orthodontist can support the effort of the parents with appliances, which succeed in stopping
the habit. Yelling and punishment are the worst possible approaches. On the contrary, what works the best is praise of the child for the effort or a small gift when the goal is achieved.