Cavities are one of the most common dental problems, and they don’t always show up in obvious places. While many people can spot one on the surface of a tooth, cavities between the teeth, also known as interproximal cavities, are harder to detect without a dental exam. These hidden holes can do just as much damage if left untreated. So, how can you tell if you have one between your teeth? Here are some signs to watch for and what you should do next.