Orajel is an over-the-counter numbing gel that temporarily blocks pain signals in your mouth. Its active ingredient, benzocaine, is a local anesthetic that comes in 10 percent (regular strength) and 20 percent (maximum strength) formulations. When you apply it to a sore spot on your gums or teeth, it numbs the area within about a minute, giving you short-term relief from oral pain.
How Benzocaine Numbs Pain
Your nerves transmit pain through tiny channels that let charged particles (sodium ions) flow in and out of nerve cells. This flow is what creates the electrical signal your brain reads as pain. Benzocaine works by physically blocking those channels so the signal never fires. It slips into the nerve membrane and prevents the channel from opening, which means the nerve can’t send a pain message to your brain.
This effect is entirely local. The benzocaine stays on the tissue where you applied it rather than traveling through your bloodstream, which is why only the area you treat goes numb. The trade-off is that the relief is temporary. Once the gel dissolves or gets washed away by saliva, the channels reopen and sensation returns, typically within 20 to 30 minutes.
What Orajel Is Used For
Orajel is designed for short-term pain relief across a range of common mouth problems:
- Toothaches: the most common use, providing relief until you can see a dentist
- Canker sores: numbs the raw area so eating and drinking hurt less
- Gum irritation from braces or dentures: reduces soreness from hardware rubbing against soft tissue
- Minor dental procedures: eases discomfort after cleanings, fillings, or extractions
- Small cuts or injuries inside the mouth: acts as a first-aid pain reliever for accidental bites or scrapes
Orajel is not a treatment for the underlying cause of your pain. A toothache caused by a cavity or infection will keep coming back once the numbing wears off. It’s a stopgap, not a fix.
Different Orajel Formulations
The product line includes several versions with different strengths and added ingredients. Regular strength Orajel contains 10 percent benzocaine, while maximum strength versions contain 20 percent. Both concentrations have been on the market since 1903 in various forms.
The nighttime formula (Orajel 4X Medicated PM) adds menthol for a cooling sensation, zinc chloride to help protect irritated tissue, and an antiseptic ingredient to reduce bacteria around the sore area. This version is designed to last longer while you sleep, when you can’t easily reapply. Orajel also makes a medicated mouth rinse for more widespread gum inflammation, which works the same way but covers a larger area than a gel or paste.
How to Apply It
Use the smallest amount that covers the painful area. A pea-sized dab is usually enough for a toothache or canker sore. Press it directly onto the affected spot with a clean finger or cotton swab and let it sit. You should feel numbness start within about 60 seconds.
Avoid eating for at least an hour after applying Orajel inside your mouth. Food can wash the gel away before it has time to work, and a numb mouth makes it easy to accidentally bite your cheek or tongue. Keep the product away from your eyes, and if you’re using it multiple times a day, space applications out rather than layering on extra gel for stronger relief. More product doesn’t mean more numbness. It just increases the amount of benzocaine your body absorbs.
Safety Risks Worth Knowing
For most adults, Orajel is safe when used as directed. The most common side effects are mild: slight stinging when you first apply it, or minor irritation at the application site. These typically fade within a few minutes.
The serious risk is a condition called methemoglobinemia, where benzocaine interferes with your red blood cells’ ability to carry oxygen. This is rare but life-threatening. Symptoms include pale or blue-gray skin (especially around the lips and fingertips), shortness of breath, rapid heartbeat, confusion, and lightheadedness. These symptoms can appear within minutes to hours of use. If you notice any of them, it’s a medical emergency.
People with certain genetic conditions affecting their hemoglobin, as well as those with heart disease or breathing problems, face a higher risk. Smoking also increases susceptibility. The risk rises with the amount of benzocaine used, which is why the “use the smallest amount needed” guidance matters.
Why It Should Not Be Used on Infants
The FDA has issued a clear warning: benzocaine products, including Orajel, should not be used on infants or children younger than 2. The agency asked manufacturers to stop marketing these products for teething pain entirely and required updated labeling with a “do not use” statement for children under 2.
Infants are especially vulnerable to methemoglobinemia because their smaller bodies absorb a proportionally larger dose of benzocaine. Their hemoglobin is also more susceptible to the chemical change that reduces oxygen delivery. Beyond the safety risk, the FDA notes that topical numbing agents offer “little to no benefit” for teething pain because saliva washes the gel off the gums quickly, and infants tend to swallow much of what’s applied.
For children between 2 and 12, benzocaine products should only be used under a doctor’s guidance with adult supervision of the amount applied.