Photon, also known as intense light or pulsed intense light (IPL), is a broad spectrum system. The absorption spectrum of melanin is distributed from 351 to 1,064 nm, and according to the theory of selective photothermal action, it is well absorbed by melanin in the hair follicle and hair shaft, leading to a sharp increase in temperature, which makes the hair follicle tissue destroyed and the hair removed. Compared with laser hair removal, the photon hair removal system has a large spot design for more uniform treatment, faster treatment speed, shorter discomfort during treatment, and improved confidence of the treated person. Each spot of the photon hair removal system is composed of a series of gentle pulses of light. This extra-long pulse width allows the treatment target to have a longer time to absorb the light heat, resulting in a gentle treatment that greatly reduces the damage to the skin and the possibility of scarring and pigmentation from the photons, improving the safety of the treatment and its effectiveness. There are 3 periods of hair growth: anagen phase, stationary phase and degenerative phase, photon has the effect of hair removal on hair in the anagen phase, while the effect of treatment on hair in the degenerative phase and stationary phase is relatively weak, so it takes several times to achieve the purpose of eradication. Do not pluck or wax hair before photon hair removal treatment, otherwise it will remove a large amount of melanin chromophore from the hair follicle. In order to reduce the absorption of hair, shave or cut the hair, clean the skin and keep about 1mm of hair, which can retain the chromophore in the hair follicle and reduce the absorption of photons by external hair. The damage of photon hair removal to the skin is very light and does not produce skin breakage, so the skin does not need to be bandaged and special care after the treatment After the treatment, appropriate cold compresses are applied to the lighted area to protect the skin. Generally, 6-8 weeks is a course of treatment, and each treatment takes only ten minutes to finish, which does not affect work and study. The whole course of treatment requires about 5 times of treatment. During the treatment period, pay attention to the protection of ultraviolet rays, apply sunscreen with high sun protection index to prevent pigmentation. Avoid eating spicy and irritating food. You can use cosmetics that do not contain alcohol and other irritating additives externally. Generally speaking, the hair in the armpits, hairline, pubic hair, calves and other parts of the body is thicker and darker, with more satisfactory hair removal effect, the hair on the lips and forearms is softer and lighter, with poorer hair removal effect, but permanent hair removal can still be achieved after several repeated treatments. Therefore, strong pulse photon hair removal is an ideal hair removal method.