Easy buy condoms on streets, store/drug markets, but difficult to buy the dental dam, here we teach you how to make a dental dam from normal condoms: 1: Carefully open package, remove condom, and unroll. 2: Cut off tip of condom. 3: Cut off bottom of condom. 4: Cut down one side of condom. 5: Lay flat and to cover vaginal opening or anus. So …