If your pearly whites aren’t so pearly white anymore, you may be considering at-home teeth whitening strips. Over-the-counter teeth whiteners are cost-effective and can significantly increase the brilliance of your smile, giving you a boost of confidence. Whitening strips use a variety of active ingredients, and it’s important to select the right type for your level of sensitivity and staining. To choose the products on this list, we spoke to a cosmetic dentist, a doctor of dental medicine,...