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The Korean life expectancy in 1911 was 24 years old and extended almost two times as of 45 years at the end of colonial period in 1945. It might be attributed by installation of tap water system in Korea. So we say ‘Water is life’. Nowadays people live longer than the past. So it is called ‘Centenarian generation’. The major roles of tap water are preventing water borne diseases such as diarrhea and heavy metal poisoning. Most of developed country equipped tap water system in each house and solved most of water borne disease. That the reason why people do not life drinking tap water anymore. People want effective water to make their life healthy by just drinking water. People living in modern society want Functional water that the water having several effects on senile disease and anti-aging process. Some people want functional water effective of non-curable disease. There are several functional water useful in daily life. Among them hydrogen water getting popularity these days. Because anti-oxidative effect of the hydrogen water has confirmed at clinical trials. Specially, effect on dementia has proved by 2 year’s clinical trial in Korea. Application of hydrogen are increasing in the medical institution and health related facilities in Korea. The modes of hydrogen usage are expanded so drinking, breathing, spraying and bathing of hydrogen are popular. Especially, bathing of hydrogen are used for two reasons, one is anti-oxidant and the other is sterilization. Product of hydrogen are being utilized for anti-aging, wrinkle improvement, symptom improvement of atopic dermatitis and alleviation of dementia etc. Especially, department of dermatology and plastic surgery hospital utilize hydrogen water for cosmetic purpose.