Based on research, I maybe don’t have a full-on cavity. There is no pain and nothing normal such as hot temperatures, cold temperatures, or eating sugary stuff (or anything in general) causes pain. My bottom back molars definitely have brown stuff in the cracks but the upper molars are pristine for some reason. I’m going to put more emphasis on brushing those molars on top and if the brown stuff goes away I can spend the money on a vehicle repair I also badly need.