The thing I noticed the first morning was my mouth felt so fresh. Instead of the normal morning breath that you think you have, regardless of whether you do or not, my mouth was really fresh. Swishing this in your mouth and through your teeth creates a mouth full of bubbles which makes everything feel clean, your gums, your teeth, your breath. The only thing I have noticed since using this, I do not like the taste of peppermint hard candies (like candy canes or the hard candy mints). I drink a lot of coffee, 2-3 cups a day and I noticed an improvement within 10 days of brighter looking teeth.