Going to see the oral surgeon was a smart move. And his explanation of the white patches as scar tissue seems logical, I don't know how long it has been since you had that surgery. But you have taken a proactive position on all this, and that will make you a winner in the process whatever you encounter in your future. I'm surprised to hear that you couldn't find a dentist that did the brush biopsy. The company that makes the Oral CDX Brush, (Oral Scans Labs), and the company that provides them to dentists (Sullivan Schein), have done a lot of marketing of them and the brush has been around for several years. More than that, the companies provide them for FREE to dentists, you only have to pay for the laboratory fee if they are used. Sounds like some of the docs in your neck of the woods need to be dragged into the 21st century...............