<unk>  is a surgical procedure performed by a dentist to expose a greater height of tooth structure in order to properly restore the tooth prosthetically.  This is done by incising the gingival tissue around a tooth and, after temporarily displacing the soft tissue, predictably removing a given height of alveolar bone from the circumference of the tooth or teeth being operated on.  While a general dentist may perform this procedure, he or she may refer the procedure to be performed by a periodontist, who will generally be both more experienced as well as specifically trained for this and other types of surgical soft tissue procedures.
Crown lengthening
Palatal expander
Otoplasty
Forehead lift
Abdominal etching
Uvulopalatopharyngoplasty
Cranioplasty
Umbilicoplasty