Shaving your head with shaving foam is not damaging to your hair, provided you use shaving foam from a regular manufacturer. The main ingredients of shaving foam are emulsifiers, moisturizers and surfactants that keep the scalp moist and reduce friction when shaving, making shaving easy to handle and reducing skin breakage. After shaving it soothes the skin and reduces scalp pain. Shaving foam has no irritating effect on the skin or hair shaft, does not damage the hair and usually has no effect on the skin. A small number of people may appear red spots, itching and other allergic symptoms, shaving foam after washing off the usually can be self-recovery, if the symptoms continue to unrelieved need to go to the hospital in a timely manner to deal with. Hair on the scalp has a certain protective effect, can reduce the impact of external forces, summer can reduce the ultraviolet radiation on the scalp stimulation, no special reasons are usually not recommended to shave the head. However, if you have lice on your scalp or have used shampoos that irritate your scalp, it is best to shave your hair in a timely manner. When shaving, it is best to use sharp knives, and need to use shaving foam or soapy water to lubricate the scalp to avoid damage to the scalp.