1. An orthodontist is a dentist who has received extra training and specialises in straightening teeth. So, if your teeth have cavities that need to be filled or if you have teeth that need to be pulled out then you should go to a dentist. If your teeth are crooked and you need braces to straighten them out, then you should go to an orthodontist. 2. This is a really good question! The word for a doctor who specialises in women's health is a gynaecologist, however there is no direct equivalent for men! A urologist is a doctor who specialises in problems of the urinal tract (for both men and women) as well as men's (reproductive) problems.