Generally speaking, thumb-sucking does not pose much of a problem unless the habit continues past the age of five or six years into the beginning of permanent tooth eruption. After that, if thumb-sucking or tongue-thrusting forces teeth out of their proper positions, the orthodontist will likely need to take steps to correct the habit. This will help ensure that no further problems will occur as well as assure that the gains made in correcting the affected teeth will not be undone by the habit in the future. To these ends, the dentist may use a habit-control device that attaches to the two upper molars, between which a barrier is positioned to block placement of the thumb or tongue.
If thumb sucking has not been stopped soon enough and damage occurs to the teeth or jaw, the services of an orthodontist may be required. Orthodontists diagnose, prevent, and treat irregularities of the teeth and face.
P.S
A habit-controlling device is likely to be more effective in breaking bad habits than a system of rewards or admonishments.
Fredericksburg Orthodontics 