I had my first cavity at the age of 25. I was terrified, but the experience was virtually painless. I didn't even feel the shots. Apparently they use a somewhat new technique to administer anesthetic - you can't feel the injections at all. If you are still going to a dentist that shoots you with the big needle, CHANGE DENTISTS!!! My only discomfort was that the back of my head hurt...I guess their headrests could use a bit more padding.