Coast Dental is a rip-off from the get-go. They over-diagnosis and then tell you you have to have special cleanings that may or may not be covered by insurance. In my case it was not.
They required that I submit to additional X-rays even though I had brought X-rays from a prior dentist that were one year old.
After reading reports from others as to how much they were taken for' I feel very fortunate that I became suspicious early on and refused to accept their diagnosis of periodontal disease. I actually lost a few dollars, but now I have fodder for a complaint to my insurance company and their sub-contractors.