Get 40% off these best-selling Lumineux Natural Teeth Whitening Strips at the Black Friday sale Amazon. The price drops from $22.99 to $13.79. This is a one-week teeth whitening treatment that uses ingredients like coconut oil, lemon peel, and Dead Sea salt. It does not use bleach or peroxide, so it's safe for your enamel and can be used by people with sensitive teeth and gums. The 21-day treatment is also on sale. Shipping is free with Prime or when you spend $35. Otherwise it adds $6.99.