It is no secret that dentists are committed to saving teeth. This is why we fill a cavity, instead of pulling the tooth when we can.
Cavities can decay a tooth to the point where restoration is virtually impossible without a procedure called crown lengthening. Crown lengthening is a routine surgical procedure, which remodels the contour of the gum line. The procedure does not actually lengthen the crown, but rather lowers the bone level and gum line. When there is not enough tooth structure to affix a crown, this is the only option. Sometimes a tooth has been broken below the gum line to the bone level. In this instance, crown lengthening is very successful in exposing more of the tooth, so that the dentist has more tooth structure to hold your crown in place. Your gums will also heal better around the new crown.