Is thumb sucking harmful to childs dental health?

Thumb sucking during the first year or two of a child’s life need not cause any concern. Any irregularities in the position of teeth that is directly due to sucking habits will probably correct itself if it corrects before the age of 5. After that however, thumb or finger sucking may affect the position of the incoming teeth and shape of the jaws. So, the child should be discouraged from sucking the thumbs or fingers.