I had crown lengthening 1 year ago and stilll have mouth face pain. It was done on the bottom back tooth. I went to see a couple of maxillo facial surgeons. None would give me a cause or diagnosis of the problem. My GP said I had neuralgia. He put me on nerve medication. I even feel burning in the eye. I was not told of these possible after effects ...Could all this be because of removing too much bone ? Anyhow all these dentists cover for the brotherhood of dentists. I would never recommend this procedure to anyone. I don't think these so-called professionals should be ruining the body to save a tooth. I don't know if something wrong was done or it is just this procedure that causes these awful after effects of burning, pulling etc...