Donna,
that's not entirely true (although it would seem that way since a few here get them on a regular basis). The PET scan is indicated for diagnosis according to the NCCN guidelines, but more than a few here have not had one (ever) and it's not common that they are given as a followup scan. PET scans are very expensive - as high as $3500, way more than an MRI or CT. I am not surprised about your oral surgeons position on PET scans, ENT's (as well) don't like any types of scan, in general. All of my scans were ordered by either my MO or RO. Yes there are false positives while tissue is still healing but the reading radiologist typically takes that into consideration on his report. There are false positives with MRI's and practically every other form of medical/lab test. This is why it is always preferable to have your doctor go over the scan reports and lab work with you.

Once health care rationing has wrecked our health care system, I am sure that you will see less PET scans being ordered.