Your bone and gum tissue should fit snugly around your teeth like a turtleneck around your neck. When you have periodontal disease, this supporting tissue and bone can be destroyed, leading to pockets. Eventually, too much bone can be lost, leading to teeth falling out or needing to be extracted. To fix this, your periodontist may recommend a regenerative procedure that will reverse some of the damage by regenerating lost bone and tissue with the help of bone grafts. Tissue grafts, procedures that place gum tissue in places where it has receded (such as exposed tooth roots), may also be utilized in regeneration procedures.