Teeth are some of the hardest substances in the body, so why do they break down? Listen to this FUN chat with dentist, Dr. Emily Swanson as she explain to us WHY teeth decay. You just might learn some tips and tricks for ways to keep your teeth healthy and free from cavities. When you're done listening to this episode, go back and listen to "How Do You Build Teeth Out of Soap?" another fabulous show with Dr. Emily!