You probadly have a cross bite . Upper teeth normaly cover the lower teeth but your dentition don't. . At your case- The posterion cross bite- the normal bite has a interfere and for maximum intercuspation, you shift your jaw to close to have a balanced relationship betwwen upper and lower jaw. The treatment plan is based on: 1- your age, 2- if you are a mouth breather or have any problem upper respiratory system, 3- any restoration with wrong occlusion. mostly the dentist neeeds to expand and align your upper teeth so you can bite down at the normal relationship.
Regards,
Dr. Vafa



