My advice is to try and save every tooth in your mouth. There is a reason why molars (flat teeth) are in the back and premolars (skinnier teeth) are located more towards the front. You should have root canal therapy in both premolar and molar, then crowns on each made at the proper level, then an implant on the lower. Intrusion of a tooth is very difficult to do.
Your teeth are "breaking off" at the roots because you have tooth decay at the surface. Your health may be a factor, but I don't know anything about your lifestyle, diet, oral hygiene habits, genetics or other health factors.Dental care is an integral component of basic health and hygienic maintenance. My recommendation is to consult with a dentist. Find someone you are comfortable with and start today to prevent further decay.
