<unk>  (or<unk> , also known as<unk>  hygiene, is the act of cleaning one's<unk> s with soap or<unk> wash and water to remove viruses/bacteria/microorganisms, dirt, grease, or other harmful and unwanted substances stuck to the<unk> s. Drying of the washed<unk> s is part of the process as wet and moist<unk> s are more easily recontaminated. If soap and water are unavailable,<unk>  sanitizer that is at least 60% (v/v) alcohol in water can be used instead, unless<unk> s are visibly excessively dirty or greasy.<unk>  hygiene is central to preventing the spread of infectious diseases in home and everyday life settings. The World Health Organization (WHO) recommends<unk> <unk> s for at least 20 seconds before and after certain activities. These include the five critical times during the day where<unk> <unk> s with soap is important to reduce fecal-oral transmission of disease: after using the toilet (for urination, defecation, menstrual hygiene), after cleaning a child's bottom (changing nappies), before feeding a child, before eating and before/after preparing food or<unk> ling raw meat, fish, or poultry. When both<unk>  and using<unk>  sanitizer are not available,<unk> s can be cleaned with uncontaminated ash and clean water, although the benefits and harms are uncertain for reducing the spread of viral or bacterial infections. However, frequent<unk>  can lead to skin damage due to drying of the skin. Moisturizing lotion is often recommended to keep the<unk> s from drying out; dry skin can lead to skin damage which can increase the risk for the transmission of infection.
Hand washing
Nail biting
Tooth polishing
Indoor tanning
Self-medication
Dipping tobacco
Mustard bath
Visiting the sick