I had a fear of dentists a few years ago but found a great dentist who understood my issues and kept me calm. I was devastated when she left the practice!
The subject of how phobias are created is a very interesting one. As we delve deeper into this issue, you soon realise that phobias are a behavioural response.
Someone once described it to me as a path in the long grass. The more you use the path the more it becomes clear and you are drawn to it. Now, start using an alternatve path and that will soon become clear while the old ones becomes overgrown and eventually non-existant. You have re-routed your brain.
In the past, I have had issues with the dentist but I tended to find that the experience was nowhere near as bad as what I had been thinking about in my mind.