In medieval times, dentistry was often performed by barbers. One popular “treatment” was a whitening technique that involved applying several coats of acid to the teeth that would turn them a brighter, whiter color. While it succeeded at bleaching the teeth, it also severely eroded enamel, leaving the teeth more vulnerable to decay. The moral of this story is that white teeth are not necessarily healthy teeth.

Luckily, modern dentists know a lot more about keeping teeth healthy and bright than medieval barbers. Here’s what you should know about how dental problems can occur in perfectly white teeth and why you should keep showing up for regular dental appointments even if your teeth seem to be looking their best.

Gum disease is an unfortunate problem to have, but it’s also an interesting topic to learn about. It begins by putting your gums in an irritating state of inflammation called gingivitis and, if left untreated, it will reach a painful and destructive level of infection called periodontitis. In honor of September being Gum Care Month, your dentist is bringing you this list of fascinating facts about gum disease to help affirm your commitment to excellent oral hygiene.