There are a few instances where crown lengthening may be beneficial for either a person that has a “gummy smile” or where a tooth has deep decay below the gum line. In the first instance, sometimes esthetic crown lengthening can help for the teeth to look proportional and the smile to look more natural. By showing more tooth and less gum the normal height proportions can been used to give a pleasant natural smile line. If a tooth has deep decay, then the recontouring of gums and sometimes bone may be necessary in order to make the crown or restoration fit accurately. The restoration must leave adequate room between the margin and underlying bone or an inflammatory response will happen.