I called a local dental clinic to schedule in a theeth whitening offer in the newspaper and was told that the first thing they do is have the dentist perform an examination, which isn't included in the offer.
When I asked about what all is included it was just the theeth whitening, no cleaning or anything else.
We were in Bucerias Mexico a couple of years ago and my wifes first cousin talked me into going to his dentist. They did 5 dental examinations by the dentist, drilled out the back of one of my theeth twice to bleach it, cleaned all of my theeth and did the zoom whitening for $285.00.
The zoom didn't hurt me at all and I was very happy with the results.