Most of the time, it doesn't hurt at all to go to the dentist.
Visiting the dentist is not an unpleasant experience for most children. If you keep your teeth healthy by brushing and flossing every day, chances are better that you'll only need to see the dentist to have them cleaned.
Dentists today have all kinds of tools to help you have a fun and pleasant experience while you are having a checkup, or teeth cleaning, or something like a cavity filled. If you need to have a cavity taken out, a filling, or if you have really sensitive teeth (when you drink really hot or cold drinks, it hurts your teeth), the dentist will give you medicine that numbs your mouth and gums. That way, when he puts instruments in your mouth to operate, it won't hurt!