Shadowless lamps are used to illuminate the surgical site for optimal viewing of small, low-contrast objects at different depths in the incision and body cavity. Since both the head and the bur of the dental handpiece may cause interference shadow to the surgical site, the shadowless mobile phone should be designed to eliminate shadow as much as possible and minimize color distortion. In addition, shadowless lamps must be able to operate continuously for a long time without giving off excessive heat, which can cause discomfort to the operator and dry out the tissue in the surgical area