Why does coffee stain teeth?
Enamel, the hard outer coating that protects the other layers of your teeth, is covered in microscopic gaps. When food and drink particles get stuck in those gaps, it forms an extrinsic stain, which just means the outer layer of your tooth is discolored. But the longer the particles stay in the gaps, they start to affect other layers of the tooth. “The more you drink [coffee] and don’t do anything to remove it, the stain goes deeper and deeper,” says Denise Estafan, an associate professor at the New York University College of Dentistry. This is called an intrinsic stain, and it’s a lot harder to clean. Here are ways you didn’t even realize you’re staining your teeth.
Brushing: Your first plan of attack
The primary cause of a tooth stain is plaque accumulation, so brushing your teeth with whitening toothpaste and seeing your dentist for regular cleanings are the best ways to prevent ugly coffee stains. By the way: Are you making these tooth-brushing mistakes?