Does it hurt a lot? I had my first (3) cavities when I was 28 and I didn't even know that I had them. I had two filled and was supposed to go back for the other, but I decided that I was scared of the dentist so I didn't get it filled. I also didn't believe that I really had three cavities. Now another tooth hurts, but not much. I always thought cavities were supposed to be painful. I don't know why I developed a fear of the dentist. I used to go a lot when I was a kid. I had retainers, braces, all of my wisdom teeth cut out, but a filling scares me.