Photonic cold gel is a transparent jelly-like substance commonly used in photorejuvenation, the biggest role is mainly the following two: 1, uniform light transmission, photorejuvenation is through the thermal effect of the laser to cause controlled damage to the skin, so as to stimulate collagen regeneration, if you play light directly in the air, the air refraction or reflection of light is not very uniform, so you can use cold gel to play light evenly on the skin, which can be very good to improve the treatment The laser has a certain thermal effect, if not operated properly for a short period of time will gather very high energy at the point of the skin, which may cause skin burns, and the cold gel can well keep the skin temperature in a constant zone, and will not increase rapidly in a short period of time, thus causing skin burns.