Dental Dams: What They Are and How to Use Them

Oral sex carries a real, if often overlooked, risk of passing STIs. A dental dam is a simple barrier that reduces that risk, yet far fewer people use one than use condoms. That’s mostly down to familiarity rather than effort — once you know how a dam works, it’s just as easy to add to your routine. Here’s what they are, how to use one, and how to improvise if you don’t have one handy.

What a dental dam is

A dental dam is a thin, flexible sheet of latex or polyurethane placed over the vulva or anus during oral sex. It acts as a barrier between the mouth and the genitals or anus, lowering the chance of transmitting infections like herpes, gonorrhea, syphilis, and HPV. Many of these can be passed through oral contact even when there are no visible symptoms, which is exactly why a barrier helps.

If intimacy and wellbeing are on your mind, you may also like Sex and Chronic Illness: Adapting Intimacy.

Dams come in different materials and sometimes flavors. If you or a partner has a latex allergy, look for a polyurethane version. They’re sold in some pharmacies and online, and are often available free at sexual health clinics.

For a related read on connection and pleasure, see Sexual Compatibility: What It Really Means.

People often assume oral sex is “safe” because it doesn’t carry a pregnancy risk, but that overlooks the infection side. A dam closes that gap with very little fuss, which is why it deserves a place in the safer-sex toolkit alongside condoms.

How to use one

Using a dental dam correctly takes only a few seconds:

• Check the expiry date and open the packet by hand — never with teeth or scissors, which can tear it.
• Lay the dam flat over the vulva or anus before any oral contact begins.
• Hold it in place throughout, and apply a water-based lubricant on the genital side for comfort and better sensation.
• Use each dam once. Never flip it over or reuse it, as that defeats the purpose.

A few extra tips help it work well: keep the same side facing the body the whole time, don’t stretch the dam tight (a little slack is fine), and avoid oil-based lubricants with latex dams, since oil weakens latex. If a dam slips or tears, stop and use a fresh one.

No dam handy? Make one from a condom

If you don’t have a dental dam, you can make one from a condom. Carefully unroll the condom, snip off the tip and the rolled rim, then cut straight up one side so it opens into a flat rectangle of latex. Lay that sheet over the area just as you would a ready-made dam.

It’s a handy backup that uses something many people already keep around. Browse condoms to keep some on hand — a non-lubricated or flavored one often works best for this. Just remember a homemade dam is single-use too, and the same rules apply: don’t flip it, and don’t reuse it. Cut it carefully on a flat surface so you don’t nick the latex, and discard it the moment you’re done.

What a dental dam does and doesn’t do

It helps to be realistic about what a dam can offer. Like any barrier, it works only over the area it covers, and only when used correctly. Used well, a dam meaningfully lowers the risk of passing infections through oral contact. But it isn’t a guarantee, and it doesn’t replace other safer-sex habits.

A few points worth keeping in mind:

• A dam covers one area at a time — you’d use a separate barrier for different acts, and a condom for penetrative sex.
• Skin-to-skin infections like herpes and HPV can still pass from areas a dam doesn’t cover, so it reduces rather than removes risk.
• Correct, consistent use matters far more than the brand or material you choose.

Thinking of a dam as one layer of protection — alongside testing and honest conversations with partners — sets the right expectations.

Why it’s worth it

Barriers for oral sex are an easy, low-effort way to reduce risk — part of safer sex without sacrificing pleasure. Adding flavored lube or a flavored dam can make the experience more enjoyable, not less, and many people find that protection actually helps them relax and stay present rather than worrying about risk.

Dams are most useful with new partners, when either of you has an untreated infection or a cold sore, or any time you simply want extra peace of mind. They’re inexpensive, take seconds to use, and ask very little of you in return for a real reduction in risk. Pair them with regular testing, and you’ve covered two of the most effective steps in oral sexual health.

FAQ

Do I really need a dental dam for oral sex?

Oral sex is lower risk than some other activities, but it isn’t risk-free — infections like herpes, gonorrhea, and HPV can pass this way. A dam is a simple way to lower that risk, especially with new or untested partners.

Can I reuse a dental dam?

No. Use each dam only once, and never flip it to the other side. Reusing or flipping it can transfer fluids and defeats the barrier’s purpose.

What lube should I use with a dental dam?

A water-based or silicone-based lubricant on the genital side improves comfort and sensation. Avoid oil-based products with latex dams, as oil can weaken latex and cause it to break.

Where can I get dental dams?

Look in some pharmacies, online retailers, and sexual health clinics, which often hand them out free. If you can’t find one, a condom cut open into a flat sheet works as a backup.

Are flavored dental dams safe to use?

Yes, flavored dams made for this purpose are designed to be body-safe and can make oral sex more enjoyable. Just check the packaging and use a fresh one each time, the same as you would an unflavored dam.

Can I use plastic wrap instead of a dental dam?

Plastic wrap is sometimes suggested as a last resort, but it isn’t designed for this and its protective value is uncertain. A purpose-made dam, or a condom cut into a flat sheet, is a more reliable barrier.

This article is for general information and is not medical advice.