Pool Water Can Stain Teeth
Swimming laps is great for fitness, but your teeth may give you away as a pool rat. Swimmers who swim more than six hours per week in a pool are at increased risk of developing yellowish-brown or dark-brown stains on their teeth, according to the Academy of General Dentistry. The stains are caused by an interaction between the chemicals in the water and saliva. The reaction causes hard, brown tartar deposits, usually on the front teeth. Swimmers who notice such a problem should see their dentist and perhaps increase their dental visits to three or four times a year.