But do they really work? To find out, I talked to dentists, who broke down everything you need to know about whitening your teeth at home, including when (and if) you’ll see a visible difference ...

For sure. As with humans, you can tell an ape’s age by looking at its teeth, says Erin Stromberg, primate keeper at the Smithsonian National Zoo. In fact, most mammals have two sets of teeth in ...