Needle-free water light uses atomized water light injection gun, using negative pressure attraction shallow guide, deep guide technology, in the dermis deep under the fixed point, positioning, fixed layer, quantitative injection of nutrient solution, without destroying the epidermis layer of the skin, so that the active ingredients of nutrient solution effectively penetrate into the skin, can achieve whitening and rejuvenation, skin tightening, deep hydration, reduce wrinkles and other effects. Under the operation of professional physicians in regular hospitals, there is usually no harm. Needle-free hydration injects nutrients into the skin by forcibly squeezing the skin through high-speed, high-pressure airflow. During this process, the skin may be overstretched and the keratinocytes on the skin surface may sometimes be slightly damaged by the high-speed airflow. Therefore, patients should avoid prolonged exposure to sunlight, avoid being in a hot environment, avoid strenuous exercise, eat more fruits and vegetables, drink more water, and at the same time can give the skin adequate hydration, and it is recommended to use medical beauty masks to promote skin recovery after the hydrafacial treatment. Hydrafacial is, after all, an invasive treatment, belongs to the medical practice, patients must find a professional doctor for evaluation, to determine whether they can do this procedure, what formula should be used to have a significant therapeutic effect. In addition, patients need to avoid pregnancy, breastfeeding and menstruation when undergoing hydrafacial treatment, and patients with a history of allergy to hyaluronic acid should not undergo hydrafacial injections.