Why does my dentist use a rubber dam?

If you've never seen a dental dam before, it can look a little strange the first time you spot one. It fits around your tooth to keep the area clean and dry while your dental provider works. Knowing what it does and what it might feel like can make a filling or root canal feel a lot less uncertain. 

What you will learn in this article: 

• A dental dam separates the tooth being treated from saliva and debris. 

• A clean, dry work area is especially helpful during bonded fillings and root canals. 

• Your dental provider may use a small clamp and frame to hold the dam around the tooth. 

• Materials not made with natural rubber latex are available for people with latex allergies. 

If you feel nervous about an upcoming procedure, schedule an appointment with an Aspen Dental provider. Your care team can explain each step before treatment begins. 

What is a dental dam? 

A dental dam is a thin sheet made with latex or a nonlatex material. It has a small opening that fits around one tooth or several teeth, separating the work area from the rest of your mouth. 

The American Association of Endodontists says dental dam isolation is essential during nonsurgical root canal treatment. It helps keep bacteria from your mouth out of the tooth and lowers the chance that dental liquids, materials or small instruments will be swallowed or breathed in.¹ 

Why does my dental provider need to use it? 

A dental dam creates a barrier between your mouth and the tooth being treated. It keeps saliva, blood, fluid from the gums and other debris away from the work area. 

For a bonded filling, a clean and dry surface gives the material better conditions to stick to the tooth. The dam may also reduce contamination when a procedure creates a fine spray in the air. These benefits help your dental provider work more clearly while adding protection for you and the dental team.² 

Is it safe to have a rubber dam placed? 

For most people, yes. Before placing one, your dental provider will consider the tooth being treated, the planned procedure, your comfort, your breathing needs and any latex allergy. Tell your dental provider ahead of time if you have trouble breathing through your nose or feel worried about having part of your mouth covered. 

How does my dental provider put it in place? 

Your dental provider makes a small opening in the sheet and fits it around the tooth or teeth being treated. A small clamp, frame or another holding method may keep the dam steady. The exact steps depend on the tooth and the procedure. 

You may feel pressure as the clamp and sheet are positioned. Let your dental provider know if anything pinches or feels uncomfortable so it can be adjusted. 

What if I’m allergic to latex? 

Some dental dams contain natural rubber latex, but nonlatex materials are available. Tell your dental provider before the visit if you have a known or suspected latex allergy. 

The American Dental Association notes that contact between latex and the soft lining of the mouth may be linked to a more serious reaction. Dental teams should ask about latex allergies and keep diagnosed patients from direct contact with latex materials. Your dental provider can select a dam and other supplies that are not made with natural rubber latex.³ 

Why does it matter during a root canal? 

A root canal requires your dental provider to clean and disinfect the narrow spaces inside a tooth. Keeping saliva and mouth bacteria out of those spaces is an important part of treatment. 

Skipping isolation raises the risk of reinfection after all that work, which is why dental dam use is considered the standard for this treatment.¹ 

What can I expect during and after placement? 

Before treatment begins, your dental provider positions the dam around the tooth and makes sure it feels secure. You may notice gentle pressure or a light pinch from the clamp. The dam does not cover your nose, so most people breathe through their nose as usual. If you are congested, rely on mouth breathing or feel uncomfortable, tell your dental provider before or during placement. 

You can agree on a hand signal so you can pause the procedure at any time. When that part of treatment is complete, your dental provider removes the clamp and dam and checks the area. 

What if I can't have a dental dam placed? 

Some teeth and some health or comfort needs can make dental dam placement difficult. For a filling or another restorative procedure, a dental provider may consider another way to control moisture, such as cotton rolls or a device called an OptraGate.² 

Root canal treatment normally requires dental dam isolation. If your dental provider cannot place one safely, they may need to adjust the plan or refer you to an endodontist. 

If the idea of a dental dam makes you anxious, share that before treatment. Reach out to your local dental provider to discuss your concerns and learn what to expect. 

Why does my dentist use a rubber dam? FAQs 

Still have questions about dental dams? These answers cover a few common concerns. 

Does the dental dam make it hard to breathe? 

Not for most people. The dam does not block your airway, but if you rely on mouth breathing or have nasal congestion, your dental provider can plan around it. Options may include letting you breathe through a gap at the side of the dam, taking short breaks or choosing a different isolation method if a dam doesn't work well for you. Speak up before your appointment so your dental provider can plan ahead. 

Will I feel pain when the dam is placed? 

No, but you may notice some sensations along the way. Some people say the clamp feels tighter than expected at first, and that eases once it's seated. If anything feels sharp or sore rather than just snug, that's a signal to speak up right away. It usually means a quick adjustment, not a bigger problem. 

Can children have a dental dam placed? 

Yes. Dental dams can be used for children when they are right for the treatment. The dental provider can explain the steps in simple language and help the child get comfortable before starting. 

How long does a dental dam stay in place? 

It depends on the procedure. The dam usually stays in place while the dental provider works on the isolated tooth and is removed when that treatment step is finished. 

What if I have latex sensitivity but need a dental dam? 

You don't have to skip your treatment, but do let your dental provider know ahead of time. Once they know about the allergy, they can switch out gloves, dam material and other supplies ahead of your visit so nothing latex touches your mouth that day, not just the dam itself. 

Sources 

¹ American Association of Endodontists: “AAE Position Statement – Dental Dams.” https://www.aae.org/specialty/wp-content/uploads/sites/2/2024/06/DentalDams_PositionStatement_v2-1.pdf 

² National Institutes of Health, BDJ Student: “Rubber Dam Isolation - When and Why to Use it? Part 1.” https://pmc.ncbi.nlm.nih.gov/articles/PMC8080201/ 

³ American Dental Association, ADA Library and Archives: “Latex Allergy.” https://www.ada.org/resources/ada-library/oral-health-topics/latex-allergy/