31 март 1945 г. - Fluoride Added to Water
Описание:
Fluoridation of community water began in 1945 in the US and became widespread in the following years. By 2012, approximately 75% of the US population was drinking water containing sufficient levels of Fluoride to prevent tooth decay.Добавлено на ленту времени:
Дата:
31 март 1945 г.
Сейчас
~ 80 г назад