Cleo,

Bone grafting is common in those cases where the wisdom tooth was in a location that resulted in a huge void in the bone once the tooth was removed.

It is also common in cases where there is no second molar or where there is bone loss around a second molar.

In some cases the wisdom tooth is located in mostly soft tissue and very little bone in which bone grafting would not be necessary.

Just a mention.... Anytime bone grafting material is placed in a tooth socket it is important for the bony socket and tissue to be healthy and free of infectious bacteria. Otherwise the graft, the socket and the bone can become a festering bacterial problem.

Bryanna