Our dental practice has recommended and applied many products from Proctor and Gamble for a lot of years, but recently we have recommended our patients discontinue the use of Crest Pro-Health Mouthwash if they notice any unusual staining of the teeth. We have become aware of persistent brown stains of the teeth associated with this mouthwash. Although the staining is removed with routine dental cleaning, there are some areas from which the stain is not easily removed, and plus, who wants to have stained teeth if it can be avoided? If you have experienced this, discuss with your dentist possible alternatives.