Benzocaine is the active ingredient in Orajel, Anbesol, and most over-the-counter canker sore gels sold in Canada. It's been the go-to canker sore treatment for decades, and for good reason — it's fast-acting, affordable, and widely available at any pharmacy.
But benzocaine has real limitations that are worth understanding before you reach for it. It manages pain temporarily without treating the canker sore itself, it comes with FDA safety warnings, and there are now alternatives that work differently.
Here's what benzocaine does, what it doesn't do, and when a different approach might serve you better.
How Benzocaine Works
Benzocaine is a topical anaesthetic — a local numbing agent. When applied to a canker sore, it temporarily blocks sodium channels in nerve fibres near the surface, preventing pain signals from reaching the brain.
What happens when you apply it:
- You apply the gel directly to the canker sore
- Benzocaine penetrates the surface tissue and reaches local nerve endings
- Within 1 to 2 minutes, the area goes numb
- Pain relief lasts approximately 1 to 2 hours
- The numbness wears off and pain returns
- You reapply — up to 4 times daily
Benzocaine treats the symptom (pain) but does not affect the canker sore itself. It doesn't kill bacteria, seal the wound, reduce inflammation, or speed up healing. The ulcer continues healing at its own natural pace while benzocaine manages the discomfort.
Benzocaine Products Available in Canada
The most common benzocaine-based canker sore products available in Canadian pharmacies include Orajel (20% concentration, gel format, $8-12 per tube), Anbesol (20%, gel or liquid, $8-12 per tube), and store-brand equivalents (20%, gel, $5-8 per tube). All of these work through the same mechanism at the same concentration. The brand differences are primarily in flavour, gel consistency, and packaging.
The Benefits of Benzocaine
Benzocaine has genuine strengths:
- Fast-acting — pain relief begins within 1-2 minutes
- Affordable — a single tube provides many applications and costs under $12
- Widely available — sold at every pharmacy, grocery store, and convenience store across Canada
- Familiar — most people have used it before and know what to expect
- Low application discomfort — the gel goes on smoothly with minimal stinging
For mild canker sores that cause manageable pain, benzocaine is a reasonable and convenient option.
The Limitations of Benzocaine
Where benzocaine falls short:
Temporary Relief Only
The core limitation. Each application provides 1 to 2 hours of numbness, then pain returns in full. Over a typical 10-day canker sore, you may apply benzocaine 30 to 50 times before the ulcer heals on its own.
No Healing Benefit
Benzocaine does not speed up healing. A canker sore treated with benzocaine heals at the same rate as an untreated canker sore — typically 7 to 14 days. You're managing pain, not treating the problem.
Reapplication Burden
Up to 4 applications per day, each requiring you to dry the area, apply the gel, and avoid eating or drinking for 15-30 minutes. Over a week, that's 28+ applications — a meaningful daily disruption.
Diminishing Returns
Some users report that benzocaine becomes less effective over the course of a canker sore — either through tissue changes at the application site or because the sore progresses to a stage where surface numbing doesn't adequately address deep pain.
FDA Safety Warnings
In 2018, the U.S. Food and Drug Administration issued a safety warning about benzocaine products, specifically regarding the risk of methemoglobinemia — a rare but potentially life-threatening condition where the blood's ability to carry oxygen is reduced.
Key points from the FDA warning:
- Benzocaine should not be used on children under 2 years old
- Adults and children over 2 should use the lowest effective dose
- Symptoms of methemoglobinemia include pale or blue-grey skin, shortness of breath, rapid heart rate, and fatigue
- The risk is low for occasional adult use but increases with frequent application
Health Canada has not issued an equivalent ban but monitors benzocaine products and includes methemoglobinemia in its adverse reaction database.
This risk is specifically relevant to benzocaine as a drug compound. Products that work through non-pharmacological mechanisms (such as medical devices) do not carry this risk.
Alternatives to Benzocaine
If benzocaine's temporary relief isn't meeting your needs — or you prefer to avoid it — here are alternatives:
Chemical Cautery (ORALMEDIC)
ORALMEDIC uses a fundamentally different approach. Instead of numbing pain temporarily, it seals the canker sore in a single application using patented HYBENX technology. The active compound desiccates damaged tissue, kills surface bacteria, and forms a protective barrier over the ulcer — covering exposed nerve endings for lasting pain relief and promoting healing within 3 to 5 days.
ORALMEDIC is classified as a Class I medical device, not a drug. It contains no benzocaine.
Key difference: One application that treats the ulcer vs repeated applications that numb the pain.
Salt Water Rinse
A simple, free alternative for mild canker sores. Dissolve 1 teaspoon of salt in warm water and rinse 3-4 times daily. It won't numb pain, but it reduces bacteria and supports natural healing.
Anti-Inflammatory Rinses
Benzydamine (Tantum) is an anti-inflammatory mouthwash available in Canadian pharmacies. It reduces swelling and provides mild pain relief through a different mechanism than benzocaine.
Prescription Options
For severe or frequent canker sores, your doctor may prescribe corticosteroid paste (triamcinolone acetonide) or systemic treatments. These address inflammation directly and may speed healing.
For a complete comparison of all treatment methods, read how to get rid of a canker sore fast.
Side-by-Side Comparison: Benzocaine vs ORALMEDIC
Benzocaine gels numb nerve signals temporarily; ORALMEDIC seals the ulcer and covers nerve endings. Benzocaine requires 30-50+ applications over 7-14 days; ORALMEDIC requires a single application. Benzocaine provides 1-2 hours of pain relief per application; ORALMEDIC provides lasting relief until the ulcer heals. Benzocaine has no effect on healing speed; ORALMEDIC promotes healing in 3-5 days. Benzocaine offers no wound protection; ORALMEDIC forms a protective eschar barrier. ORALMEDIC has a brief sting (5-15 seconds) during application; benzocaine goes on with minimal discomfort. Benzocaine is an OTC drug (benzocaine 20%); ORALMEDIC is a Class I medical device with no benzocaine. Benzocaine costs $8-12 per tube; ORALMEDIC is $19.95 per 2-pack ($10 per ulcer).
Which Should You Choose?
Benzocaine is a reasonable choice when:
- You have a mild canker sore that's more annoying than painful
- You need quick, temporary relief before a meal or at bedtime
- You're looking for the lowest upfront cost
- You're already familiar with it and it works well enough for you
ORALMEDIC may be the better choice when:
- You have a severe or very painful canker sore
- You're tired of reapplying gel 4 times a day for a week
- You get recurring canker sores and want faster resolution
- You want to avoid benzocaine entirely
- You want to treat the ulcer, not just manage the pain
Both are legitimate options. The right choice depends on the severity of your canker sore and what outcome you're looking for.
Have questions about ORALMEDIC? Visit our FAQ.