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Wikipedia talks about hair removal:

The Bahá'í religion explicitly prohibits head-shaving. In Judaism, the shaving of certain parts of the head (peot) using a metal blade against the skin is forbidden, however, electric razors may be used, since the actual cutting blade never touches the skin. Sikhs take an even stronger stance, opposing all forms of hair removal. One of the Sikh "Five Ks" is Kesh, meaning "uncut hair". To Sikhs, the maintenance and management of long hair is a manifestation of one's piety.