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Written by Ann C. McCulloch, MBA | Medically Reviewed by Bradley Allen Eli, DMD, MS
New jaw pain after a dental injection is usually caused by strain to the temporomandibular joint (TMJ) and surrounding muscles from prolonged mouth opening, not nerve damage from the needle itself. Direct nerve injury from a dental injection is rare, occurring in roughly 1 in 26,000 to 160,000 injections, and it typically presents as numbness or tingling rather than pain. If soreness, limited opening, or pain with chewing develops after a dental visit, jaw sprain/strain is the far more likely cause, and it usually responds well to rest, ice or heat, and gentle stretching.
If a trip to the dentist leaves you with lingering jaw pain, it’s natural to assume the pain and the injection are connected. However, direct nerve injury after a dental injection is exceedingly rare. A 2022 systematic review of nerve-related adverse effects following mandibular nerve block anesthesia placed the risk at roughly 1 in 26,000 to 160,000 injections, meaning the average dentist may see this complication only once or twice in a career. Persistent pain after a dental procedure should still be brought to the attention of your dentist.
When there is nerve damage after an injection, the symptoms are typically prolonged anesthesia (lack of sensation, numbness) or paresthesia (“pins and needles,” tingling, burning) along the distribution of the affected nerve.
A possible indicator of direct nerve injury is a “shock” sensation at the time of injection. This sensation is relatively common, occurring in roughly 5% of injections, but it rarely results in lasting symptoms.
Depending on the injection site, disturbances in taste can also occur with direct nerve injury.
The mechanisms of nerve damage after dental injection include bleeding around the covering of the nerve (a hematoma), neurotoxicity of the local anesthetic, and direct injury from the needle. The prognosis for full recovery is good, with roughly 85% of patients recovering within 8 weeks of the injury. If symptoms are still present two weeks after an injury, an orofacial pain specialist can help confirm the diagnosis and guide treatment.
Jaw sprain/strain after dental work may be coincident with a dental injection. If the pain is more in the teeth and gums, the primary culprits are gum inflammation, pulpitis (inflammation of the dental pulp), and soft tissue injury. True jaw pain after a dental injection, however, is more likely to come from muscle injury combined with strain to the temporomandibular joint (TMJ) and surrounding structures. The sustained jaw opening required during a dental procedure can cause muscle strain and fatigue, resulting in jaw pain.
Here’s what happens with jaw strain from dental procedures:
Lingering TMJ pain after dental work should be taken seriously because it can convert into a chronic pain condition and increases the risk of re-injury with subsequent dental procedures. “Not only is jaw sprain/strain after lengthy dental procedures common, it’s also cited as the initiating factor by more than 50% of patients with chronic TMJ pain,” explains Bradley Eli, DMD, MS, who specialized in the treatment of orofacial pain.
How can you tell if your TMJ pain is from nerve injury or jaw strain? The key factor is the symptoms you feel. Nerve injuries present with numbness and tingling, whereas jaw strain is felt as soreness with chewing, limited range of motion, and jaw muscle tenderness. Symptoms can last as little as a few days or as long as several weeks.
If you have these symptoms, speak to your dentist right away so they can help you manage a jaw sprain/strain before it gets worse.
The optimal protocol for TMJ strain follows an orthopedic model of joint pain. This includes the following measures:
These components of TMJ injury care are included in the Speed2Treat® Home Healing Kit from Orofacial Therapeutics, which combines jaw rest guidance, hot/cold therapy tools, and short-term splint support into a single recovery protocol for acute jaw strain.
Most jaw pain after a dental visit is mild strain that improves within days to a couple of weeks. Watch for these signs that point to something that needs professional evaluation:
Jaw pain after a dental injection is usually from muscle and joint strain caused by holding the mouth open for an extended period, not from the injection itself. Direct nerve injury from the needle is far less common and produces different symptoms, such as numbness or tingling rather than soreness.
Permanent nerve damage from a dental injection is very rare, occurring in an estimated 1 in 26,000 to 160,000 injections. Jaw sprain/strain from prolonged mouth opening is more common but is also typically temporary, especially when addressed with jaw rest, hot/cold therapy, and stretching early on.
For most people, jaw strain from a dental procedure improves within a few days to a few weeks. Nerve-related symptoms, when they do occur, have a good prognosis, with most patients recovering within about 8 weeks.
Some numbness immediately after a local anesthetic injection is expected and temporary. Numbness, tingling, or burning that persists well after the anesthetic should have worn off is not typical and should be evaluated by your dentist.
If jaw pain is mild and improving, home care is usually sufficient. You should contact your dentist or an orofacial pain specialist if you have numbness or tingling, if pain hasn’t started improving after one to two weeks, or if jaw opening remains significantly limited.
A short-term anterior bite guard, such as the QuickSplint®, can help relieve TMJ muscle hyperactivity and allow the joint to rest while it recovers from strain. It’s intended as a temporary part of a broader recovery protocol rather than a long-term solution on its own.
