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Causes of tongue pain after dental anesthesia
hello. I’m Dr. Sangchul Hwang, who studies and treats autonomic nerves. Have you suffered from tongue pain after dental anesthesia…? Have you ever had dental work done and the anesthesia wore off, but you were left with a hot tongue, numb lips, or a sore palate? Many people think this is just residual anesthesia, but it can actually be a side effect of lidocaine or nerve irritation, which can cause tongue nerve damage, irritation of the inferior alveolar nerve, or palatine nerve problems.
Dental Anesthetic Lidocaine Side Effects and Neurotoxicity
Lidocaine is the most commonly used local anesthetic in dentistry, but it can cause neurotoxic reactions in some individuals and under certain circumstances. A 2014 study observed concentration-dependent cell damage and death when human oral cells were exposed to lidocaine, and a 2020 review article reported that all local anesthetics can be neurotoxic above a certain concentration. Nerve damage as a side effect of lidocaine is particularly likely to occur if the anesthesia needle is inserted close to a nerve, a high concentration of anesthetic is left in place for a long time, or a hematoma forms from bleeding at the injection site and compresses the nerve.
Which nerve is damaged determines symptoms
The symptoms of a hot tongue or numb lips after dental anesthesia vary depending on which nerve has been irritated, so if you can pinpoint the sensations you’re experiencing, your provider can relatively quickly estimate whether the tongue nerve, the inferior alveolar nerve, or the palatine nerve has been damaged, and the direction of treatment will be clear.
Common symptoms of tongue nerve damage
If the tongue nerve is irritated or damaged, the tongue will burn, sting, and feel like you’ve eaten something hot and spicy, and it will often feel swollen and very sensitive to even the touch of a toothbrush. This is because the tongue nerve is in the path of the anesthesia needle and is easily irritated by direct contact or the spread of anesthetic.
Common symptoms of lower otolithic nerve injury
The hypoglossal nerve is responsible for sensation in the lower jaw, lower lip, and lower teeth. When this nerve is irritated, you may feel like your lips are swollen but seemingly intact, or you may feel a throbbing, aching, pressing pain on the inside of your lower jaw that feels like a toothache. This often occurs when a needle is placed near the nerve during a mandibular anesthesia or dental implant procedure.
Common symptoms of palatine nerve injury
If the palatine nerve is irritated, the roof of your mouth will be sore and sensitive to anything that touches it, burning when you eat hot foods and a stabbing pain when you chew hard foods. This can happen when the anesthetic spreads to the palate or when the maxillary anesthesia is too deep.
I treat symptoms by dividing them into three causes
The first is the accumulation of neurotoxicity due to lidocaine side effects, which requires detoxification and metabolic repair to reduce the accumulated toxic response in the nerve, rather than simple circulatory therapy. The second is physical damage to the nerve itself, such as a tongue nerve injury or a lower ear nerve injury, in which case treatment to induce nerve regeneration and repair is key. The third is when the nerve is compressed by a hematoma at the injection site, which requires treatment to decongest the blood to relieve pressure and restart stagnant circulation.
If left untreated, it’s long-lasting, but early treatment determines recovery
If left untreated, symptoms of tongue pain, hot tongue, and numb lips after dental anesthesia can last anywhere from a few months to a year or more, and if nerve damage is entrenched, recovery takes even more time. However, with early and accurate nerve diagnosis, restoration of circulation, and treatment focused on nerve regeneration, they can actually improve within a few months.
Wrapping up
A hot and burning tongue, dull and heavy lips, throbbing lower jaw, and sore palate are not just anesthesia residuals, but can be signs of lidocaine side effects or nerve damage. Recognizing the symptoms and responding early is the most important key to nerve recovery.
