Upper left tooth extraction 16wks ago & my bone still hasnt came back & i was told today that i literally have no bone. will my face start to sink in.

Doubtful: Changes in facial appearance usually occur when multiple teeth are missing.

Bone loss: If teeth are decayed, or if gums infected, there can be bone loss previous to extraction. Single tooth bone loss will not cause change in facial drape. If you are c concerned, a Periodontist or Oral Surgeon can replace the bone and place an implant on which your Dentist can fabricate a crown. Talk to your Dentist.