The simplest and most common way to give your teeth a little bit of a whitening lift is to use over-the-counter whitening toothpastes. All toothpastes work at whitening your teeth, as one of the primary ingredients is a mild abrasive that's meant to scrub off food and drink stains.
Whitening toothpastes, however, offer a little extra kick thanks to some added chemicals like sodium tripolyphosphate. The toothpastes differ from gels and strips because they don't contain peroxide or other bleaches. Using whitening toothpaste a couple of times a day should yield results in a couple of weeks, and they've been shown to be safe to use. They can also be used in conjunction with other at-home whitening products. Just look for toothpastes that have been given the stamp of approval by the American Dental Association (ADA).