Smooth tube-shaped device, usually made of plastic, that comes in a range of sizes. Vaginal dilators are used to treat some symptoms of menopause, certain types of sexual dysfunction, or other medical conditions. During dilator therapy, you put a dilator in your vagina to help stretch and shape your vaginal canal. Vaginal dilators can also help your vagina maintain shape and function during cancer treatments, or after certain medical procedures like gender-affirming surgery.