When Does Dental Numbness Wear Off, and What Should You Do When It Doesn't?
Quick answer: After a typical filling or crown, numbness lasts about 1 to 3 hours in the upper jaw and 3 to 5 hours in the lower jaw. If your lip, chin, or tongue is still numb the next morning, call us. It is almost always temporary, but we want to know.
If you have ever left our chair feeling like half your face belonged to someone else, you are in good company. Whether you came in for a routine filling or a , that heavy, tingly sensation is a normal part of dental care. It also makes talking, sipping water, and smiling feel a little silly, and it leaves many patients asking the same question: how long is this going to last?
Here is what to expect, how to keep yourself safe while you wait, and when lingering numbness deserves a phone call.
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or most patients, local anesthetic wears off within 1 to 5 hours. Where you land in that range depends on four things.
1. Where in your mouth you were numbed
Upper teeth. We usually numb upper teeth with a small injection placed right next to the tooth. The anesthetic only has to cover a small area, so it fades quickly, typically within 1 to 3 hours.
Lower back teeth. These almost always require a nerve block, an injection placed near the main nerve trunk that supplies half of your lower jaw, lip, chin, and tongue. Because the whole territory goes numb at once, expect 3 to 5 hours, and do not be surprised if your tongue is the last thing to wake up.
2. Whether the anesthetic contained epinephrine
This is the single biggest factor. Most dental anesthetics include a tiny amount of epinephrine, which narrows blood vessels and keeps the medication near the nerve longer. That is what gives us a comfortable working window. Epinephrine-free anesthetics wear off noticeably faster, and we use them for some patients with heart conditions or other .
3. Which anesthetic was used
Everyday anesthetics like lidocaine and articaine follow the timeline above. For surgical procedures such as , we sometimes use a long-acting anesthetic called bupivacaine on purpose, because it keeps you comfortable for 8 to 12 hours while the site settles. If that was part of your visit, we will tell you, and the "next morning" rule below still applies.
4. The length of the procedure
A longer appointment may mean a second or third dose partway through. More anesthetic near the nerve simply takes longer to drift away.
Your own circulation, age, and body chemistry play a role too. The anesthetic does not wear off because your liver processes it. It wears off because blood flow gradually carries it away from the nerve, which is why some people always seem to stay numb a bit longer than others. (A small number of people have the opposite problem and struggle to get numb at all. We wrote about that in )
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A little. There are two things that genuinely help.
Gentle movement. A short walk raises circulation, which speeds the clearing process modestly. It will not turn five hours into one, but it helps.
A reversal injection. There is an FDA-approved medication (phentolamine, sold as OraVerse) that we can inject at the end of your appointment to open the blood vessels back up. In clinical trials it cut the time to normal lip sensation roughly in half. If you have a meeting, a presentation, or a lunch date after your visit, ask about it before we start.
Rubbing, pinching, or massaging the numb area does not help and can bruise the tissue. Please leave it alone.
What to do (and not do) while you are numb
Your nerves are not sending pain signals, which means you have lost your built-in warning system. A few simple rules keep you safe.
Do not chew solid food until sensation returns. It is remarkably easy to bite your tongue, cheek, or lip at full force and not feel it. Stick to smoothies, yogurt, and soup you can sip.
Skip hot drinks. Hot coffee or tea can burn the inside of your mouth before you realize anything is wrong. Cool or room-temperature liquids only.
Be careful with your lip. Many patients unconsciously chew or suck on a numb lip. If you notice yourself doing it, stop; a lip bite can take a week to heal.
Wait to brush or floss the area until you can feel it, or follow the specific we gave you.
If your child was numbed: kids are the most likely to bite themselves, and the bite can look alarming (a swollen, white, or ulcerated lip the next day). Watch them closely, keep them on soft foods, and remind them every few minutes not to chew on their lip or cheek. If a bite does happen, keep the area clean, offer cold foods, and call us if it looks infected or is not improving after a few days. Our covers more.
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In the vast majority of cases, that pins-and-needles feeling is simply the nerve coming back online. Occasionally, though, numbness lasts longer than expected.
When it does, the cause is usually that the nerve was irritated near the injection site, either by the needle itself or, more often, by the anesthetic solution. Dentists call the result paresthesia: lingering numbness, tingling, burning, or an odd "rubbery" feeling in the lip, chin, or tongue. Research shows the tongue is the nerve most often involved, in roughly 80 to 90 percent of injection-related cases, so a tongue that stays numb after your lip has recovered is the classic presentation.
Two things are worth knowing:
It is rare. Large studies put the risk of a lasting problem after a lower nerve block somewhere between 1 in 25,000 and 1 in 160,000 injections.
It usually resolves on its own. Most cases improve over several weeks, and the majority are fully back to normal within about two months. A small number take longer, which is why we like to document it early and follow you until it is gone.
This is different from numbness after surgery near the nerve, such as removing a deeply impacted wisdom tooth or placing a lower implant. That is a separate conversation we would have with you before the procedure.
When to call our office
Please reach out if you notice any of the following:
Numbness still present the next morning (or more than 12 hours after a routine filling or crown).
Sharp, electric, zapping sensations, or persistent burning.
Swelling, severe pain, or fever developing around the injection or treatment site.
A lip or tongue bite that looks infected or is not healing.
Difficulty swallowing or breathing. Seek emergency medical care immediately, then let us know.
Dr. Henley provides after-hours care for urgent situations, and our page explains how to reach us. For everything else, at 904.398.1549 or Smile@cjhenleydmd.com.
If needles are the part of the visit you dread, you are not alone, and we can help with that too. See , or read about the now available for many upper-tooth procedures.
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No. Routine numbness should be gone by bedtime. Numbness the next morning is usually harmless and temporary, but we want to examine and document it, so please call.
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The nerve to your tongue runs right beside the nerve to your lower lip, and it is more sensitive to the anesthetic. It is also the most common nerve involved in prolonged numbness, so if it lasts past the next morning, call us.
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Yes. Local anesthetic does not affect your alertness or reflexes. This changes if you received sedation, in which case you will need a ride.
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Cool, soft foods you do not need to chew are fine. Hold off on anything that requires biting until you can feel your lips and tongue.
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Why is my heart racing after the injection? That is the epinephrine. It is a small dose, it is normal, and it passes within a few minutes.
Peer-reviewed sources
Pogrel MA, Thamby S. Permanent nerve involvement resulting from inferior alveolar nerve blocks. J Am Dent Assoc. 2000;131(7):901-907.
Hillerup S, Jensen R. Nerve injury caused by mandibular block analgesia. Int J Oral Maxillofac Surg. 2006;35(5):437-443.
Hillerup S, Jensen RH, Ersbøll BK. Trigeminal nerve injury associated with injection of local anesthetics: needle lesion or neurotoxicity? J Am Dent Assoc. 2011;142(5):531-539.
Garisto GA, Gaffen AS, Lawrence HP, Tenenbaum HC, Haas DA. Occurrence of paresthesia after dental local anesthetic administration in the United States. J Am Dent Assoc. 2010;141(7):836-844.
Malamed SF. Local anesthetics: dentistry's most important drugs, clinical update 2006. J Calif Dent Assoc. 2006;34(12):971-976.
Reviewed by CJ Henley, DMD, 2026