I had four teeth missing due to some birth defect. The dentist I visit did an orthodontic treatment first for 2 years to get the teeth array aligned. Then suddenly without properly informing me, he cut the healthy teeth he arranged, using a his tools and installed a fixed bridge on the upper jaw and the lower jaw. The upper incisor and the canines were cut, they were healthy, and in the lower jaw the incisors were cut to put the fixed bridges respectively. Now they are not very strong, as I have to take precautions always when eating or smoking ... as they get hurt very quickly and the normal bite force is also not there, 50%. The original teeth is cut, I presume its gone, though I would want it back. What is the best treatment now to fix the current issue?