“…Treatment of thumb-sucking habit using a fixed tongue crib appliance -a case report and literature review If the habit continues beyond the age of four to five years it is associated with dental changes in the primary, mixed and secondary dentition, such as an anterior open bite, 8 which frequently leads to a secondary tongue thrust habit. 14 Other changes include: Class II molar and canine relationship, 15 excessive overjet, 16,17 maxillary protrusion, 18 posterior cross bite, 19 digital deformity 20 and paronychia. 21 The adverse effects associated with thumb sucking are dependent on its frequency, intensity, duration and position of the digit in the mouth.…”