"i&#039;ve been on birth control pills for 10 years; yasmin, yaz, whatever came next, then zarah. my acne decreased with the exception of the placebo pill week. my cramping was never as bad and i never got pregnant which is the main point! now, i&#039;ve been off the pill for 4 months trying to conceive. i haven&#039;t had a single mouth ulcer. i never went more than 2 weeks without one. i knew if i bit my lip i&#039;d have one within a few hours. if it was the week of my menstration, i&#039;d have at least one. usually i had at least 2 at any given time. also, almost every time i&#039;d go to the dentist, i&#039;d have a new cavity. i&#039;ve looked it up and i believe that the hormones from the pill increased my mouth difficulties."