They say the 18th of every month is called Tohatsu no hi(頭髪の日), Day of Hair because 18 is 10 plus 8 and 10 is read as to and 8 is read as hatsu. Tohatsu (頭髪)literally means head hair. Tohatsu no hi was established by Zenkoku Riyo Kankyo Eisei Kyodo Kumiai Rengokai(全国理容環境衛生協同組合連合会), National Barber Environmental Sanitation Cooperative Association (?) in 1978.
Oct. 20 is also called Tohatsu no hi(頭髪の日), Day of Hair, but this was established by Nihon Mohatsu Kagaku Kyokai(日本毛髪科学協会), Japan Hair Science Association.
They say the lifespan of men's hair is 4 to 5 years, and women's is 4 to 6 years, and a hair grows 0.3mm to 0.5mm in a day which becomes about 1.2cm in a month. Of course it depends on the person. According to the hair cycle about 50 to 100 hairs fall out daily.
Barbershop is tokoya (床屋) and beauty salon is biyoin (美容院) in Japanese.
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