Crown lengthening is a process of reshaping the soft gum tissues and bones in order to expose more of natural tooth/teeth. Crown lengthening can help change a gummy smile. Depending on the complexity of the condition dentists set treatment plans for cosmetic enhancement. Sometimes simple scalpels may be sufficient to remove excess gum tissues and improve the smile. In other cases where there is a cavity below the gum line dentists may remove some portion of the supporting bone structure to restore the tooth and contour the gum tissues accordingly.