Let’s start with the most obvious reason for gum soreness: just having gotten dental work done. If you were hanging out with your mouth open for an hour while your dentist poked and prodded around in there, it’s not all that surprising that you may be sent home with sore gums along with your shiny new toothbrush. Beyond that, Dr. Chern says inflammation is another main cause of gum soreness, specifically gingivitis.
Dr. Chern says another cause of sore gums is canker sores, shallow ulcers that form in your mouth. These pesky sores can pop up at any time on the lips, cheeks, tongue, or gums. The last major cause of sore gums according to Dr. Chern is spicy food. Eating spicy foods doesn’t automatically make your gums feel sore, but if you’re sensitive, they certainly can.