Very interesting about narrow upper arch and scalloped tongue being linked. Both my upper arch and jaw are narrow and my tongue is scalloped, particularly on the right side. I also have a pronounced linea alba on the left cheek. I've been wondering if this was a result of the Bell's Palsy I had on the left in 2002? Ever since then my left cheek lies very close to my teeth on the left and my tongue has tended to lie more to the right side of my mouth.

I've mentioned this to my dentist and everyone else but nobody seems to have a clue.

@Jacko- you might want to contact Dr. Brad Neville, he is the senior dental pathologist at the Medical University of South Carolina in Charleston. He might be able to give you some leads. He and surgeon Terrence Day wrote a very interesting article on oral cancer for an oncology journal a couple of years ago. I don't have the copy in front of me just now but you can access it on the web.