Yes, staining can happen to patients who swim a lot. The water in pools have antimicrobial chemical additives which give the water a higher pH than saliva, causing salivary proteins to break down quickly and form organic deposits on swimmer’s teeth. This is called “swimmers’ stain.” Pool water can also lead to dental erosion. There’s not a lot a swimmer can do to prevent this, but an electric toothbrush and fluoride toothpaste is recommended. If the staining is really bad the patient may want to tighten up their recall appointment to remove the stain.