Hi jeneffer,

One thing to know in case you have not been informed is that if the teeth being removed are abscessed or root canaled, then the jaw bone may not be healthy enough to receive a bone graft when the teeth are extracted. Bone grafting is more successful and much less likely to become infected if the area of jaw bone receiving the graft is healthy.

If the teeth being extracted have not infected the jaw bone and the bone is healthy enough to receive the grafts, then the reason for placing the grafts is to reduce the amount of overall bone loss that occurs when teeth are extracted. When a tooth is extracted, there is about 50% bone loss which means the height and width of the bone recedes over time. A successful graft will reduce the bone recession and preserve the level of bone at a higher amount compared to not having the bone graft.

I hope this information is helpful to you.
Bryanna