After tooth extraction, if the walls of the socket are very thick, they will usually fill naturally with bone in two-to-three months. However, when the walls of your socket are very thin (such as in your upper and lower front teeth), this type of healing will not be as predictable. In these situations, a bone graft is often placed at the time of tooth extraction to help your body fill in the empty socket with bone. This step will maintain the width and volume of bone you will need for dental implant placement several months later.