Did you mean flouridated instead of chlorinated water? I've never heard of chlorine affecting tooth decay; it's normally added to water supplies to control germ

Did you mean flouridated instead of chlorinated water? I've never heard of chlorine affecting tooth decay; it's normally added to water supplies to control germs. Flouride on the other hand is routinely added expressly for this purpose, although whether it is either effective or wise to do so is the subject of many bitter and divisive debates in communities.