Even though you can likely only see an average of three of them, your teeth actually have five surfaces, including the front, back, two sides, and the biting edge or chewing surface. However, while the three easily visible areas can be properly cleaned with your trusty toothbrush, the sides that touch each other (known as interproximal) can be harder to access, and thereby more prone to cavities and decay. Here’s how to keep them healthy despite this!