Dental dams can be used during oral sex to protect against STDs. Dental dams are thin, square, or rectangular latex sheets It is used by dentists during oral surgery and other procedures. It is not a method of birth control. But it can be used to help protect people from STIs, including HIV, during oral-vaginal or oral-anal sex. It is placed over the opening to the vagina or the anus before having oral sex. Materil: Latex. Size: 15.5×15.5cm or …