After a tooth is extracted, a bone graft can be placed into the remaining root socket to preserve as much bone as possible for future implant placement. Ten to twelve weeks later, an implant can be placed in the exact position of the tooth.  If a bone graft is not placed at the time of tooth extraction, natural  bone loss will occur which may eliminate the possibility of implant placement in the future. It is much easier to prevent bone loss by placing a bone graft at the time of extraction than to regenerate lost bone years after a tooth is extracted. 

Placing a bone graft at the time of tooth extraction can still be beneficial if a patient wants to have dental implants in the future and wants to slow the natural bone loss process.