I am curious, if you are employed what line of work are you performing? Occupational exposure/sensitivity (from out working say on a farm or whatnot) are not unheard of. Until you can touch bases with your dentist you might consider adding a little lemon juice to your water (if your stomach can tolerate it) to help cut down on bacteria growth. A sibling's dentist recommended that after a dental procedure, so I don't see the harm in doing that prophylactically.