Protrusion of your upper front teeth can be the result of frequently repeated habits such as finger or lip sucking, or tongue thrusting. If your first molar is forward to its proper relationship with the lower first molar, as indicated by the red arrows, either your lower jaw is underdeveloped or your upper jaw has grown too much. Protrusion of the upper teeth makes them more susceptible to accidents due to their isolation. Your speech may also be affected because of the inability to have proper lip seal or tongue piosition.