With the current relevant research, laser hair removal itself is harmless to human body. Laser hair removal technology is using the principle of photothermal dynamics to selectively damage the hair follicle tissue and make the hair lose its regeneration ability to achieve hair removal effect. Laser hair removal can prolong the time of hair regeneration, and after several operations, permanent hair removal can be achieved. Compared with other hair removal techniques, laser hair removal is more convenient, gentle, long lasting, and low irritation to the skin, usually without local skin redness and swelling, inadvertent skin scratches, etc. Laser hair removal technology is suitable for candidates with overly dense and vigorous hair, fair skin tone but darker hair pigmentation. Different wavelengths, pulse widths and energies lead to different laser treatment times. The higher the laser energy, the more likely it is to cause pain, which usually falls within the tolerable range and it is recommended to follow the doctor’s advice on the operation. However, for some people with sensitive skin or special body type, as well as improper operation or use of irregular products, it may cause allergy and pigmentation, or redness, blistering and other phenomena. Therefore, it is recommended to consult with the dermatology or plastic surgery departments of regular hospitals to determine whether your skin is suitable for laser hair removal before using laser hair removal technology. In addition, proper and reasonable hair removal can play an aesthetic role, but excessive hair removal needs to be avoided. When the weather is hot, sweat hair can help the body sweat and cool down; when it is cold, it can retain the residual temperature of the body and has the function of assisting in regulating the body temperature, when the body does not have sweat hair, it may cause the body temperature regulation function disorder, causing chills, hypothermia and other phenomena.