Crown lengthening procedure often required to enhance the appearance of patient smile. Whether they performed for the purpose of exposing sound tooth structure, or to enhance the appearance of the definitive restorations, these procedures must be planned to satisfy biologic requirements, while simultaneously avoiding deleterious esthetic effects. A variety of laser has been used for hard tissues and soft tissue procedure for circlet lengthening in dentistry. This study describe crown lengthening procedure done by using Nd:yag and Er:yag for both hard and soft tissues. Nd:yag (1064nm) was used for soft tissue crown lengthening and Er:yag (2940nm) was used for hard tissue lengthening,and discussing the observed changes with two types of lasers for the period of one month.

Keywords: Laser; Crown Lengthening; Soft Tissue Laser; Hard Tissue Laser; Crown Esthetics.