Markymark,
Please, everybody in here is too old to be lectured on the fact that people should not go into things for money. There is nothing wrong with asking that question at all. Money is a motivating factor. I'm not saying to go into things just for money, but in the same respect it is foolish to be hired at a job and not ask the income that you are going to make. People in the real world weigh job offers and choices, and then try to integrate them into their life plans. So please, no more lectures.
Priya,
In answer to your question, it really depends. On average Endodontists make the most money because of such small overhead. Their income is about 500-700k. Orthodontists, who average about 450k, have a greater earning potential though. I personally know an orthodontist who nets (before taxes, but after expenses) 1.2 million. He was just in the right place at the right time though. Then again, I know of a General Dentist who nets (before taxes, but after expenses) about 850k. So, go figure <img border="0" alt="[Wowie]" title="" src="graemlins/wowie.gif" /> . Hope that answers your question.
P.S. Sorry if there are any words spelled incorrectly.