Dental Numbness Calculator

How long does dental numbness last?

For most fillings and extractions, lip and cheek numbness wears off in about 2 to 3 hours (Oxford Health NHS patient leaflet). It can last longer after a lower-jaw injection, and much longer with a long-acting anesthetic. Your teeth usually stop feeling numb first, then your tongue, then your lip. After an extraction, the Wisdom Teeth Recovery Tracker shows what else is normal on the first day.

How long it lasts depends on three things:

• Which anesthetic your dentist used, and whether it contains a vasoconstrictor (epinephrine or levonordefrin). A vasoconstrictor narrows nearby blood vessels, so the anesthetic stays in place and lasts longer.
• Which jaw. Lower back teeth usually need a nerve block, which numbs a wider area for longer.
• You. People vary. Even in large trials, the times spread out a lot from person to person.

Typical times by anesthetic

These are the soft-tissue (lip and cheek) times from the US FDA labels, where the label gives them. The last column is the window the calculator shows.

Sources don't fully agree. A dental textbook summary (Malamed, 2005) gives longer lip numbness for lidocaine and articaine, 3 to 5 hours. But two large trials of anesthetics with a vasoconstrictor (Hersh 2008, 484 people) measured a median of about 2 h 13 min for the upper lip, 2 h 35 min for the lower lip and 2 h 5 min for the tongue. That means half of people had normal feeling back sooner than that. The calculator stays close to the labels and the trials, and says so when it has to use a textbook figure.

"Novocaine" (procaine) is an old name many people still use for any dental numbing shot. If you don't know what you had, use I don't know.

Upper vs lower jaw

Upper teeth are usually numbed by an injection into the gum next to the tooth (infiltration). Only a small area goes numb, usually part of the upper lip and cheek.

Lower back teeth usually need a nerve block near the back of the jaw. It numbs the teeth on that side plus half the lower lip, chin and tongue. That's why the lower jaw stays numb longer. For lidocaine, the label gives about 2½ hours for an upper-jaw injection and 3 to 3½ hours for a nerve block.

Ways to wear it off faster (and myths)

The one method shown in clinical trials to shorten numbness is a reversal injection, phentolamine (OraVerse®) (Hersh 2008; FDA label). Your dentist gives it at the end of the visit, into the same spot. In its trials, it cut the median time to normal feeling by about:

In children aged 6 to 11, it shortened lip numbness by about 75 minutes (56%). OraVerse only works with anesthetics that contain a vasoconstrictor. It's approved for ages 3 and up and isn't recommended for children under 15 kg (33 lb).

You may read that exercise, massage, warm compresses or caffeine make numbness wear off faster. We found no good studies showing they work. Rubbing or heating a numb lip can hurt it without you feeling it.

If the injection itself worries you, the Dental Anxiety Test helps you plan what to tell your dentist next time.

How long after a filling can I eat?

Wait until the numbness has worn off, usually about 2 to 3 hours. The FDA labels for lidocaine and articaine say patients shouldn't eat until normal feeling returns, because you can bite your lip, cheek or tongue without noticing. Cleveland Clinic says eating sooner won't damage the new filling itself, but waiting protects your mouth. If you do eat before then, chew slowly and carefully. Your dentist may give extra advice for your type of filling, so follow it.

After a tooth extraction, the wait is different: see when you can eat and drink after an extraction.

Kids and lip-biting

Children often chew or suck a numb lip or cheek because it feels strange. They don't feel the damage until the numbness wears off, and then the lip can be sore and swollen. The data sheet for one common anesthetic (articaine) says these accidental injuries were more frequent at ages 3 to 7.

• Watch your child until feeling is fully back.
• Skip chewy food until then. Soft food and cool drinks are fine.
• Remind them not to bite or play with their lip.
• Call the dentist if the lip looks badly hurt or swollen.

When numbness is not normal

Call your dentist if:

• You're still numb the next day. Numbness that lasts for weeks after a lower-jaw injection is very rare (the articaine data sheet classes it as "very rare"), but it should be checked.
• You've burned or bitten your lip, cheek or tongue while numb and it looks infected or very swollen.

Call 911 for face swelling or trouble breathing or swallowing.

How this tool works

1. You enter the time of the injection, the jaw, the anesthetic (or "I don't know"), whether you had a reversal shot, and whether it's for a child.
2. Window. If the label gives a range (for example 3 to 3½ hours), we use it. If it gives one "about" figure (for example about 2½ hours), we show half an hour either side. If the label gives no lip time, we use the textbook range and tell you. For "I don't know", we use 2 to 3 hours (NHS leaflet), stretched to 3½ hours for the lower jaw (the lidocaine label's nerve-block figure).
3. OraVerse shortens the window by the label's median percentage (for example 62% for the upper lip). It's switched off for plain mepivacaine and plain prilocaine, which have no vasoconstrictor.
4. Times are rounded out to whole 5 minutes, and the result is always a range, never a single minute.
5. The countdown updates while the page is open. Save to My Smile keeps today's times on this device, so the page remembers them if you come back.

This is a typical range, not a promise. Your own numbness may wear off sooner or later.

Frequently asked questions

Sources

1. U.S. FDA label via DailyMed (Dentsply). XYLOCAINE Dental (lidocaine HCl and epinephrine) injection. updated August 13, 2026. Accessed October 26, 2026.
2. U.S. FDA label via DailyMed (Septodont). SEPTOCAINE (articaine HCl and epinephrine) injection. updated October 23, 2024. Accessed October 26, 2026.
3. U.S. FDA label via DailyMed (Septodont). CARBOCAINE (mepivacaine HCl 3%, and 2% with levonordefrin 1:20,000) injection. updated February 21, 2024. Accessed October 26, 2026.
4. U.S. FDA label via DailyMed (Dentsply). CITANEST PLAIN Dental (prilocaine HCl 4%) injection. updated November 10, 2021. Accessed October 26, 2026.
5. U.S. FDA label via DailyMed (Dentsply). CITANEST FORTE Dental (prilocaine HCl 4% and epinephrine 1:200,000) injection. updated February 29, 2024. Accessed October 26, 2026.
6. U.S. FDA label via DailyMed (Septodont). VIVACAINE (bupivacaine HCl 0.5% and epinephrine 1:200,000) injection. updated February 16, 2024. Accessed October 26, 2026.
7. U.S. FDA label via DailyMed (Septodont). ORAVERSE (phentolamine mesylate) injection. updated December 5, 2018. Accessed October 26, 2026.
8. Hersh EV, Moore PA, Papas AS, et al. Journal of the American Dental Association 2008;139(8):1080-1093. Reversal of soft-tissue local anesthesia with phentolamine mesylate in adolescents and adults. 2008. Accessed October 26, 2026.
9. Malamed SF. Dimensions of Dental Hygiene. Up Close. June 2005. Accessed October 26, 2026.
10. ClinicalTrials.gov (Dalhousie University), NCT02995291. Reversing the Effects of 0.5% Bupivacaine: A Randomized Controlled Trial. updated January 29, 2020. Accessed October 26, 2026.
11. Medsafe New Zealand. New Zealand Data Sheet: SEPTANEST 1:100,000 and 1:200,000 (articaine with adrenaline). revised June 1, 2021. Accessed October 26, 2026.
12. Oxford Health NHS Foundation Trust. Oxfordshire Community Dental Service: Mouth care after surgery. reviewed July 18, 2025. Accessed October 26, 2026.
13. NHS. Wisdom tooth removal (Recovering from wisdom tooth removal). reviewed June 12, 2024. Accessed October 26, 2026.
14. Cleveland Clinic. Dental Fillings: Types, Materials & What They're For. reviewed May 13, 2024. Accessed October 26, 2026.

Last reviewed October 26, 2026 by the Dental Health Time editorial team, against the sources above. How we review.