help,

i went to the dentist and he noticed a white patch on retromolar area, behind my last molar, anyway, ive spent numerous hours on the net to find any pictures that might match, nothing really comes close, and then i looked the other day and the other side of my gums, behind the molar, same spot yet opposite side, showing a bit of whitish color, that of the other side, does cancer spread that way, going on both sides of bottom gums same area, im just scared and trying to figure out what it is, i asked the dentist if he had seen anything like it, he says no, but wouldnt he know what cancer looks like, i've been waiting 28 days now for results, and with being a single parent with two young kids, this is killing me, anyon