Topical anesthetics (Orajel) for toothaches: a temporary fix or a permanent solution

Over-the-counter numbing agents such as Orajel are topical anesthetics that contain benzocaine and are intended to temporarily desensitize soft tissue in the gums. Medical literature supports that benzocaine relieves toothache pain [1] (Hersh et al., 2013). They work well for small mouth sores, but they can not penetrate tooth enamel to reach the inflamed nerve. If you have a deep cavity, an abscess, or irreversible pulpitis, our team at Clove Dental recommends you see one of our dentists.

The Benzocaine Blockade: Why Gels Only Numb the Surface

A topical anesthetic is a medication intended to block nerve signals in the oral mucosa, which is the soft, skin-like lining of your mouth. Benzocaine is the active ingredient in products such as Orajel, and its molecular structure is effective at desensitizing soft tissue. Clinical evidence supports that Benzocaine is a commercially available local anesthetic in the amino ester class, used in a variety of settings, including dental procedures, preparation for infiltrative anesthesia, and minor trauma [2] (Singh et al., 2024). However, it lacks the chemical "drive" to penetrate the hard, mineralized layers of your enamel and dentin. With a deep cavity or internal infection, the pain comes from the dental pulp in the center of the tooth. Because the gel cannot soak through the tooth’s "armor," it never reaches the actual source of the discomfort. You might feel a tingling sensation on your gums, but the internal nerve keeps firing pain signals, leading to the common experience of the medicine "wearing off" in just minutes. 

Recognizing the Signs of Benzocaine-Induced Tissue Damage

 Over-applying numbing gels is a common reaction to a severe toothache, but it can lead to a secondary problem called chemical tissue necrosis. Your gum tissue is delicate. Repeated exposure to high concentrations of benzocaine can cause the acid in the gel to make the top layer of your gums slough off or turn white. You might notice a stinging sensation that feels different from your toothache, or your gums may look raw and inflamed. At Clove Dental, we often see California patients who have accidentally created a "gum burn" by leaving a gel-soaked cotton ball against their tooth overnight. This soft-tissue damage can make your eventual dental treatment more uncomfortable, as the gums must heal before certain procedures can be performed. 

Methemoglobinemia: The Hidden Systemic Risk of OTC Gels

Clinical evidence indicates that Topical anesthetics, such as benzocaine, have been reported to cause methemoglobinemia, in which hemoglobin is unable to release oxygen effectively to body tissues [3] (Veltri et al., 2016). While rare, the overuse of benzocaine carries a serious medical risk called methemoglobinemia. This condition significantly reduces the amount of oxygen carried through your bloodstream. The FDA has issued specific warnings regarding this risk, especially for children and seniors. Symptoms can appear within minutes or hours of using the gel and include pale or blue-colored skin, lips, or fingernail beds. You might also feel an unexplained shortness of breath or a rapid heart rate. Because this is a systemic reaction rather than a localized one, rinsing your mouth won't fix it. If you experience these symptoms after using a numbing product, you should bypass the dental office and head straight to a California emergency room.

Comparing Relief Methods: OTC vs. Professional Care 

When to Use Orajel vs. When to Call Clove Dental 

Sometimes a topical gel is the right tool for the job. Understanding the difference between soft tissue pain and a dental emergency can save you hours of discomfort. Numbing gels are excellent for "surface-level" issues, including:

• Canker Sores: Small, painful ulcers on the inside of the cheek.
• Denture Sores: Localized spots where a prosthetic is rubbing against the ridge.
• Orthodontic Irritation: Areas where a bracket or wire is poking the lip.

However, if your pain is triggered by biting down, sensitivity to cold/hot liquids, or a constant "heartbeat" sensation in the jaw, the issue is structural or internal. These symptoms indicate a cracked tooth or a pulp infection that no amount of surface gel can resolve.

Professional Palliative Care: The Safe Path to Permanent Relief

 If you are using numbing gels because you are traveling or waiting for an appointment, Clove Dental offers a safer alternative called professional palliative care. Unlike the "one-size-fits-all" approach of a drugstore tube, our California team uses clinical-grade desensitizers and sedative fillings to stabilize your tooth. If you have a large cavity, we can place a temporary medicated filling that contains eugenol (clove oil). This material actually reaches the dentin to calm the nerve from the inside out. This provides hours or days of relief, not minutes. This approach stops the pain safely and prevents the infection from spreading, giving you a comfortable path to a permanent filling or crown without the risks of OTC chemical overuse. 

FAQs

1. Can I put Orajel directly into a hole in my tooth? 

You should avoid this. While it might provide a second of relief, the gel can trap bacteria inside the cavity, potentially accelerating the infection. It is also difficult to wash out, which can interfere with the bonding process when you finally get your filling.

2. How often can I safely apply topical numbing gel? 

Most labels suggest no more than four times a day. If you find yourself needing it every hour, the "temporary" phase has passed. Your body is telling you that the underlying issue is too deep for surface-level medicine.

3. Is there a difference between "Maximum Strength" and "Professional" gels?  

 Most over-the-counter maximum strength gels contain 20% benzocaine. While this is the highest legal limit for home use, it still lacks the delivery system to penetrate a tooth. Only a dentist can provide localized "blocks" that completely shut down the nerve. 

References 

[1] Hersh, E. V., Ciancio, S. G., Kuperstein, A. S., Stoopler, E. T., Moore, P. A., Boynes, S. G., Levine, S. C., Casamassimo, P., Leyva, R., Mathew, T., Shibly, O., Creighton, P., Jeffers, G. E., Corby, P. M., Turetzky, S. N., Papas, A., Wallen, J., Idzik-Starr, C., & Gordon, S. M. (2013). An evaluation of 10 percent and 20 percent benzocaine gels in patients with acute toothaches: efficacy, tolerability and compliance with label dose administration directions. Journal of the American Dental Association (1939), 144(5), 517–526. https://doi.org/10.14219/jada.archive.2013.0154

[2] Singh R, Patel P, Al Khalili Y. Benzocaine. [Updated 2024 Mar 20]. In: StatPearls [Internet]. Treasure Island (FL): StatPearls Publishing; 2026 Jan-. Available from: https://www.ncbi.nlm.nih.gov/books/NBK541053/

[3] Veltri, K. T., & Rudnick, E. (2016). Benzocaine-Induced Methemoglobinemia: A Case Report. P & T : a peer-reviewed journal for formulary management, 41(3), 180–191.