About the Dental Dam

The dental dam is a six-inch- square piece of thin latex, much like the latex in condoms, that is used to prevent the transmission of sexually transmitted infections (STIs) during oral sex. The dental dam is placed over the vulva or anus to act as a barrier between the mouth and the vagina or anus. Dental dams come in plain and flavored latex squares. A flavored water-based lubricant may enhance the taste during oral sex.

How the Dental Dam Works

When used properly, dental dams provide an effective barrier to the exchange of bodily fluids during oral sexual activity. Dental dams can significantly reduce the risk of coming in contact with a sexually transmitted infection, but are not 100 percent effective.

How to Use Dental Dams

Always rinse the dam first, to remove the powdery talc, which should never enter the vagina or anus. Pat it dry with a low-lint towel or let it air-dry ahead of time.

Before having oral sex, hold the edges of the dam with your hands, spreading it over the entire vulva, covering both the vaginal opening and clitoris. In the case of oral-anal contact, use the dam to cover your partner's anus.

Don't ever share the same dam. Never reuse it. Always use separate dams if you are practicing both oral-vaginal and oral-anal sex, because anal organisms can be harmful to the vagina and vice versa. Always remember to use a new dam each time you have oral sex.

If you don't have a dam, you can substitute a piece of plastic wrap. However, the dental dam is more flexible and therefore less likely to tear. Also, remember that certain plastics, like those used for some trash bags, may contain toxic chemicals that can endanger your health.

Dental dams cost anywhere from 50 cents to around $3 each, depending on size, color, flavor, etc. Buying a multi-pack makes them cheaper. They are available at dental and medical supply stores and at Tapestry Health locations.

How to Protect Against STIs and HIV/AIDS

The only way to guard against getting sexually transmitted infections (STIs) is not to have sex or to ave sex only with partners who you know are free of infection. If you do have sex, you should use a latex barrier, such as a male condom, a female condom, or a dental dam, every time. Condoms provide protection against against STIs, including HIV, the virus that causes AIDs. Tapestry Health clinicians recommend using such barriers even in combination with other methods of birth control. Latex condoms are preferred to lambskin condoms for the prevention of STIs. Using a spermicide together with a latex barrier can also help keep you from getting an STI.

If you have questions about the dental dam or any STIs, talk to your clinician.