Now that it’s wintertime and we still need to exercise, do you swim at the local YMCA – or spend all your free time in the pool? If you spend more than 6 hours in a pool every week, you could be putting your teeth at risk! Because pool water that contains too much chlorine is dangerously acidic… and when highly-acidic water comes into contact with tooth enamel for extended periods, you can develop so-called “swimmer’s calculus”… a build-up of calcium that can turn your teeth yellow or brown. Excess chlorine can also leave your teeth brittle and sensitive. So, if you swim frequently, brush your teeth when you climb out of the pool. Also, consider using a fluoride rinse to help strengthen your teeth.