What happens next in this paragraph?

How to whiten your teeth when you have braces
Consider using whitening toothpastes.
Look for brands that are american dental association (ada) approved, because they contain fluoride: a mineral essential for dental health.
Whitening toothpastes contain special abrasives such as baking soda and peroxide to remove surface stains from teeth.
OPTIONS: A. Read product reviews to find out if there are any approved brands in your area you can use. Find some local dentists or dental agencies.. B. Expect at least a teaspoon of fluoride a day-it takes some time to get the whitening effect. Try combining products with specific dental ingredients.. C. However, these products will only remove surface stains. They will not change the color of your enamel entirely.. D. Always follow the manufacturer's instructions on brushing and flossing. Brush and floss your teeth once daily..
C.