10 Teeth-Whitening Kits That Actually Work

SmilePro Teeth Whitening Kit ($69, originally $137)

This product not only has glowing reviews — over 3,400 of them, to be exact — but it also promises a brighter smile in just seven days. The SmilePro kit uses a dual-LED mouthguard and whitening pen combo that's both enamel-safe and sensitivity-free, making it a great choice for those who've had bad experiences with harsher treatments. The blue light works to lift stains (coffee, wine, etc.), while the red light helps soothe gums, a bonus for anyone who wants results without discomfort. Each kit includes 30 treatments for less than $2.50 a session, and it's backed by a 30-day satisfaction guarantee.