Why Debacterol Works Better at the Dentist Than at Home

TL;DR

Debacterol works by chemically destroying the surface of a canker sore, which takes the pain away quickly. It only works where it touches, though. If part of the sore is missed, usually an edge, that part keeps hurting, and it feels like the treatment failed. Getting the whole sore covered depends on three things that are hard to manage in your own mouth and easy in a dental chair: keeping the area dry, seeing the entire sore including its edges, and being able to reach it. That's why we recommend professional application in every case, and why we don't publish instructions for doing it yourself. The practical part is getting it done: call ahead to make sure the office stocks it, go early while the sore is open and painful, tell them where the sore is and how long you've had it, and know what to expect afterward. Debacterol's main benefit is fast pain relief; it hasn't clearly been shown to make sores heal faster (Rhodus & Bereuter, 1998 — PMID: 10196853).

Why Professional Application Works Better

Saliva gets in the way

Debacterol has to stay in contact with a dry sore to work. Saliva dilutes it and washes it away. The moment you open your mouth and bring something toward a sore, your mouth tends to make more saliva, which works against you.

A dental office deals with this routinely. There's suction to clear saliva, cotton rolls to keep the area isolated, and often a gentle stream of air to dry the surface. At home, you're blotting with a tissue and hoping.

You need to see the whole sore

The edges of a canker sore are where the nerve endings are most exposed, and they're the part most often missed. A dentist has a bright overhead light, a small mirror that can see angles you can't, and instruments to hold the lip, cheek, or tongue out of the way. In front of a bathroom mirror, part of the sore, usually an edge, is often in shadow or out of view.

Some sores are just hard to reach

Location matters a lot:

• Easier to reach: the inside of the lower lip, the front of the gums, the inside of the cheek toward the front.
• Harder: the sides and underside of the tongue, the floor of the mouth, the soft palate.
• Very hard without help: near the tonsils, the back of the tongue, the back of the cheek.

Large (major) canker sores often show up in the back of the mouth, which means the sores that most need effective treatment are often the hardest to reach yourself. See Giant Canker Sores.

The dentist can check the result

The treated tissue turns white as soon as Debacterol works. A dentist who can see the whole sore can confirm that every part of it changed, and make sure nothing was missed, before you leave.

It's a caustic chemical

Debacterol damages any tissue it touches, not just the sore. Its label warns against prolonged contact with normal tissue (Debacterol prescribing information — DailyMed). A dentist working on a dry, isolated, well-lit area is much less likely to let it reach healthy tissue around the sore. For what can go wrong, see Did Debacterol Make My Canker Sore Worse?.

How to Get It Done

1. Find a dentist who has it

Not every dental office stocks Debacterol, and availability has been inconsistent at times. It's more common in offices that treat a lot of mouth conditions, including oral medicine practices. Call before you go and ask directly:

"Do you carry Debacterol, or do you do in-office treatment for painful canker sores?"

If they don't have it, ask what they do offer. Many offices can prescribe a steroid gel, and some offer laser therapy. Our directory can help you find someone nearby.

2. Go while the sore is open and painful

Debacterol is a treatment for an open sore, and its benefit is pain relief. So it's most worthwhile early in a sore's life, in the first few days after it opens, when most of the painful stretch is still ahead of you. Treating a sore that's already a week in and closing up gives you less benefit, and the treated area still has to heal.

If you get sores often, it helps to have a plan before the next one: know which office has Debacterol, and ask whether they can fit you in on short notice for a painful sore.

3. Tell them what they need to know

When you call and at the appointment, mention:

• Where the sore is and roughly how big
• How long you've had it
• Whether you get them often, and whether this one is typical for you
• Any sulfur allergy (Debacterol's label says not to use it in people allergic to sulfur in any form)
• Whether you've had Debacterol before, and whether it worked. If the pain came back at one edge last time, say so. It tells the dentist coverage was the issue.

4. What happens at the appointment

The dentist will look at the sore to make sure it's a canker sore and not something that needs a different treatment, such as a herpes sore or an injury from a sharp tooth. Then they'll dry and isolate the area and apply the medication to the sore.

You'll feel a sharp, intense burn for several seconds. For most people, the sore's usual pain then drops dramatically within minutes. The treated area turns white or grayish, and it may look bigger than the sore did before, because the treatment covers the rim as well as the center. The whole thing usually takes a few minutes.

5. What happens over the next few days

The white layer is shed as the tissue heals underneath. The area may feel tender again for a short while, but it should be milder than the original sore and keep improving. The sore still has to heal; Debacterol takes away most of the pain while that happens.

6. When to go back

Call the dentist if:

• The pain comes back strongly at one edge within a day or two. That usually means part of the sore wasn't covered. Don't treat it again yourself; whether to re-treat is the dentist's call.
• Pain keeps getting worse after the first two or three days.
• A raw or white area spreads beyond where the sore was.
• You get swelling, fever, or pus.
• The sore isn't clearly smaller within a week to ten days.

Any mouth sore that's still there after three weeks needs to be checked, no matter what was used on it. See Canker Sore Won't Heal.

Questions Worth Asking

A few questions can save you a wasted trip and help you get the most out of the visit:

• "Is this definitely a canker sore?" Herpes sores inside the mouth, injuries from a sharp tooth or appliance, and reactions to medications can all look similar, and Debacterol won't help them.
• "Is this sore a good candidate?" Very large sores, sores far back in the mouth, or clusters of tiny sores may be better handled another way.
• "What should I do if the pain comes back at an edge?" Knowing the office's plan ahead of time means you won't be tempted to deal with it yourself.
• "Can you prescribe a steroid gel for me to keep at home?" For many people, having one on hand to start at the first tingle is the most useful thing to come out of the visit.
• "Should we look into why I get these so often?" If you get sores frequently, ask about blood tests for B12, ferritin, folate, and zinc, and a celiac screen.

What About Home Kits?

Debacterol is sometimes prescribed for home use to people who get frequent, severe sores. We still recommend having it applied by a dentist, for the reasons above. If your dentist does prescribe it for home use, ask them to apply it once while you watch, so you can see what complete coverage looks like and get their advice on your particular sores. We don't publish self-application instructions, because the difference between treating the sore completely and burning the healthy tissue next to it comes down to the control a dental setting provides.

Cost

What you pay depends on your insurance and the office. Some plans cover it, some don't, and the visit itself may be billed separately. See How Much Does Debacterol Cost? for what to ask.

If Debacterol Isn't an Option

• A prescription steroid gel or paste is the standard treatment, widely available, and helps sores heal faster than placebo. Ask for one to keep at home.
• Laser therapy is offered by some dentists and has trial evidence for both pain relief and faster healing. See Laser Treatment for Canker Sores.
• Silver nitrate is more commonly stocked, but it can leave permanent gray or black staining in the tissue. Given the choice, we recommend Debacterol. See Silver Nitrate for Canker Sores.
• In the UK, Ireland, and Australia, a similar product called Oral Medic is sold in pharmacies. See Oral Medic and Hybenx.

For an overview of what Debacterol does and the evidence behind it, see the Debacterol review.

While You're Waiting for an Appointment

A dissolving barrier patch is the most practical stopgap. It covers the sore so food, drinks, and your tongue don't hit it.