Out of the blue, I am told I need a deep cleaning treatment - two sides, two hours each - $2500. My last exam a year ago did not show all this decline she says I now have. This is a very popular dentist but neither I or DH really feel like she is trustworthy as she recommends crowns and fillings at every visit. What does one do in this case - start over and get another opinion? At the least, if it is truly necessary, it seems like a peridontist would be a better option since it is surgery. Thoughts?