I think looking at an x-ray film of a person's mouth should be pretty cut and dried when it comes to things like whether or not there's an actual cavity in a tooth.
I have had my dentist just say, "It's an etch in the enamel. . .I'll keep an eye on it."
Another dentist could have called that "etch" a "cavity." And being in the healthcare field confers very little advantage. Other than understanding radiographic physics concepts better than the average Joe, I rely totally on my dentist's call on the matter (and I think I have a good one); I can't look into my mouth and know if something needs work.
I guess it's a matter of degree and aggressiveness on the part of the dentist.
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