Micro restorations are mainly used in fixed (crown and bridge) type restorations, in order to repair dental defects (hard tissue defects such as extensive tooth decay, discoloration, after root canal treatment, etc.) or single missing teeth, the abutment teeth are ground down and crowns of similar size and appearance to the original teeth are made. Restoring the integrity, aesthetics, and mechanical strength of the affected tooth, etc. When a fixed restoration is performed, the affected tooth is first ground down (tooth preparation) in order to obtain the material thickness space, seating channel, and retention type needed for the crown. The preparation of the tooth is the key to obtaining a satisfactory result for the crown restoration. If the preparation is poor, the amount of preparation is too small, and the edges of the crown do not fit well, the edges of the crown will easily cause redness and bleeding of the gums. Prolonged redness and bleeding can lead to receding gums and affect periodontal health. Micro restorations involve the use of optical magnification equipment (microscope, loupe) for tooth preparation. The surgeon can complete a more precise dental preparation in the magnified view. Minimally invasive and delicate has been achieved.