Fluorosis is known since the 18th century, and the "involvement" of fluoride in this disease of teeth was established only in the 1930s.
Fluorosis is known since the 18th century, and the "involvement" of fluoride in this disease of teeth was established only in the 1930s.
user
Флюороз відомий ще з 18 століття, а "причетність" фтору до даної хвороби зубів встановили лише в 30-х роках 19 століття.
assistant