Hello,
Vaginal dryness can be due to low estrogen levels - seen during menopause, stopping
birth control medications, having a baby, or as a side effect of certain
medications. Also, high levels of stress can cause vaginal dryness. Cigarette smoking can also cause vaginal dryness. Rarely medical conditions like sjogrens syndrome can cause these symptoms.
You can change the birth control and check if vaginal dryness continues. If it does, then the causes mentioned above have to be ruled out.