What is a cavity?
A cavity or tooth decay is a small hole in your tooth that needs to be filled.
What causes tooth decay?
The main culprits to blame for your cavity are certain types of bacteria in your mouth. These bacteria are contained in plaque and they interact with the carbohydrates and sugars in your food creating an acidic environment that dissolves the protective enamel on the outer layer of your tooth. Once the acid succeeds in eroding the enamel, your tooth is exposed, leaving just the softer dentin layer, which will ultimately cause the formation of a cavity. At this point the decay process rapidly speeds up and spreads deeper into the tooth.
Why Do I Need A Filling?
A filling is necessary to treat your cavity because if left untreated the decay will eventually grow and will enter into your nerve canal. And yes, this can be as painful as it sounds. It can also lead to more serious problems such as infection or abscess.
It could also cost you a lot more money to fix. The bottom line is you should get your cavity filled as soon as you can.