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Hygiene is an old concept related to medicine, as well as to personal and professional care practices related to most aspects of living, although it is most often wrongly associated with cleanliness.[citation needed] In medicine, hygiene practices are employed as preventative measures to reduce the incidence and spreading of disease. Other uses of the term appear in phrases including: body hygiene, mental hygiene, domestic hygiene, dental hygiene, and occupational hygiene, used in connection with public health. The term "hygiene" is derived from Hygienic, the Greek goddess of health, cleanliness and sanitation. Hygiene is also the name of a branch of science that deals with the promotion and preservation of health, also called hygienics. Hygiene practices vary widely, and what is considered acceptable in one culture might not be acceptable in another.