birth control
"I'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've been off the pill for 4 months trying to conceive. I haven't had a single mouth ulcer. I NEVER went more than 2 weeks without one. I knew if I bit my lip I'd have one within a few hours. If it was the week of my menstration, I'd have at least one. Usually I had at least 2 at any given time. Also, almost every time I'd go to the dentist, I'd have a new cavity. I've looked it up and I believe that the hormones from the pill increased my mouth difficulties."