@strawCake - Dental x-rays are a good idea since some of these cysts don't cause symptoms. However, some of them I'm sure you would definitely notice!
Take the primordial cyst, for example. The article says that it forms where a tooth should be. So obviously, if you have a cyst and not a tooth you need to get yourself to the dentist!
Anyway, any kind of oral infection scares me. Your mouth is not that far away from your brain, and it's easy for infections in that area to spread to your brain. Scary!