Anbesol can provide temporary relief from a toothache, but it works best for certain types of dental pain and has real limitations. Its active ingredient, benzocaine at 20% concentration in the Maximum Strength formula, numbs tissue on contact and typically kicks in within a minute or two. How well it works depends on where your pain is actually coming from.
How Anbesol Numbs Pain
Benzocaine is a topical anesthetic, meaning it blocks nerve signals in the tissue it directly touches. When you apply Anbesol gel to your gums, it temporarily prevents the nerves near the surface from sending pain signals. This makes it effective for pain originating in the gums or the soft tissue around a tooth, such as irritation from a canker sore, a cut, or gum inflammation.
For deeper tooth pain, the picture is more complicated. A toothache often comes from the pulp, the living tissue inside the tooth itself. Because benzocaine works on surface tissue, its ability to reach and numb pain deep inside a tooth is limited. That said, a clinical study testing both 10% and 20% benzocaine gels found that they were effective for temporary relief of toothache caused by irreversible pulpitis (infection or inflammation of the inner tooth). The relief was meaningful but short-lived, which is the key tradeoff with any topical numbing agent.
How to Apply It
For Anbesol Maximum Strength, the recommended dose is a pea-sized amount applied directly to the painful area. You can reapply up to four times daily. More than that increases your risk of side effects without adding much benefit, since the numbing effect wears off within 15 to 30 minutes regardless of how much you use.
Dry the area with a tissue or cotton ball before applying. This helps the gel stick to the tissue and absorb more effectively rather than getting diluted by saliva. Press a small amount onto the sore spot with a clean finger or cotton swab and avoid eating or drinking for a few minutes afterward.
What Anbesol Won’t Do
Anbesol treats the symptom, not the cause. It does not reduce inflammation, fight infection, or heal damaged tooth structure. If your toothache is caused by a cavity, a crack, or an abscess, the pain will return as soon as the numbing fades because the underlying problem is still there. Relying on Anbesol for days or weeks while avoiding a dentist can allow a treatable issue to become a serious one.
Over-the-counter anti-inflammatory pain relievers like ibuprofen work differently. They reduce inflammation throughout the body, including deep inside the tooth, and their effects last several hours per dose. For most toothaches, an anti-inflammatory pill will provide longer and more complete relief than a topical gel. Many people find the best short-term strategy is combining both: ibuprofen for sustained pain control and Anbesol for spot relief during pain spikes, especially at night.
Safety Concerns With Benzocaine
Benzocaine carries a rare but serious risk. The FDA has issued warnings that it can cause methemoglobinemia, a condition where the blood’s ability to carry oxygen drops dramatically. Symptoms include pale or bluish skin, shortness of breath, rapid heartbeat, and confusion. While this reaction is uncommon in adults using the product as directed, it can happen after a single application.
Children under 2 should never use benzocaine products. The FDA specifically warns against it in this age group because young children are more vulnerable to methemoglobinemia and less able to communicate early symptoms. For adults, sticking to the recommended four applications per day and using the smallest effective amount reduces risk.
Some people also experience localized allergic reactions: swelling, redness, or a rash at the application site. If the area around the application becomes more swollen or painful after use, stop applying it.
When a Toothache Needs More Than Anbesol
A toothache that lasts more than a day or two, or one that keeps getting worse, is your body signaling that something needs professional attention. Certain symptoms indicate the problem is progressing beyond what any over-the-counter product can manage. Facial swelling, a pimple-like bump on the gum near the painful tooth, fever, or a foul taste in your mouth all suggest an abscess, which is a pocket of infection. Left untreated, bacteria from an abscess can enter the bloodstream and spread to other parts of the body, including the heart and brain.
A cracked tooth or a lost filling also warrants a prompt call to your dentist, since exposed inner tooth structure is vulnerable to rapid infection. If you experience sudden pain in your lower jaw and neck, especially with a history of heart problems, that pattern can mimic dental pain but may actually be cardiac in origin.
Anbesol is a reasonable tool for getting through a night or a weekend before you can see a dentist. It is not a substitute for figuring out why the tooth hurts in the first place.