The Idaho Senate has rejected a resolution lauding water fluoridation.

BOISE • The Idaho Senate has rejected a resolution lauding water fluoridation.

Community water fluoridation to prevent tooth decay started to become common in the United States after a series of studies in the 1940s, and is recognized by the Centers for Disease Control and Prevention as “one of the 10 great public health achievements of the 20th century,” as Senate sponsor Abby Lee, R-Fruitland, said Thursday. Most water systems in Idaho don’t add fluoride since it occurs in the water here naturally.