Be weary, and ask for prices upfront.
I went in for a routine cleaning/check-up on my first visit. They suggested some work I needed done (capping some exposed gums), which would cost me about $160 after insurance, plus the cost of cleaning.
They then suggested a "deep-cleaning" instead of the standard, which I agreed to, as I had no idea it would cost dramatically more.
Needless to say, when I walked out, they had maxed out my insurance ($1000), charged me $600, and then six weeks later sent me a bill for another $200, saying they had made an "adjustment".
In the end, it cost $1800 to get my teeth cleaned and to get a few caps put on my exposed gums.
I was treated by Dr. Prepall, a hygenist, and a tech. The quality of the work was average. I spent about 5-6 hours at the office.
I am used to paying less than $100 for a cleaning - so this was quite a shock.
Ask for pricing on everything up front. I felt like they talked me into things I didn't need, and then failed to disclose the actual out of pocket costs.