Negotiating with your dentist over the cost of treatment is not something that you should do without a lot of thought, especially if you have a bad toothache and need to have a tooth removed with some urgency.
This video shows you how to negotiate with your dentist in a businesslike manner, but be warned if you are thinking of attempting something like this, as after all, once the treatment has begun, you are at the mercy of your dentist until he has finished.