Smile design is the planning and pre-visualization of the desired end result of an esthetic dental treatment targeting a more harmonious state instead of the current disharmony, according the rules of facial, smile, tooth and gingival harmony and the individual needs of the patient paying particular attention to the functional aspects and feasibility.

PRINCIPAL OF SMILE DESIGN
1.Registration and Medical, Dental history of patient.
2.Record of patient own smile with model analysis with occlusion study model.
3.Evaluating digital smile photograph and video.
4.Evaluation of certain elements in specific sequence
    a) Facial analysis – general facial balance
    b) Dento-facial analysis -maxillo-mandibular relationship to face and dental midline relationships to the face.
    c) Dento-labial analysis - the relationship of the teeth to the lips
    d) Dento-gingival analysis - the relationship of the teeth to gingiva
    e) Dental analysis – inter tooth and intratooth relationship
5.Evaluation of smile design also divided into four parts.
    a) Facial esthetics
    b) Gingival esthetics
    c) Micro esthetics
    d) Macro esthetics
6. Rule of golden proportions
7. Principal of the red proportions