Last updated: August 2026. Sources: NHS.uk, NHS inform Scotland, University Hospitals Sussex NHS Foundation Trust, the NHS Specialist Pharmacy Service, All Wales Therapeutics and Toxicology Centre, and peer-reviewed dental research. All clinical details verified on 12 August 2026.
TL;DR Dental numbness from a local anaesthetic usually wears off within two to five hours, though a lower jaw injection can leave the lip, tongue and chin numb longer. Numbness inside the tooth itself fades sooner. Contact your dentist if numbness or tingling has not started improving after about a week.
You leave the surgery with a filling done, a tooth out, or a course of treatment finished, and half your face still feels like it belongs to someone else. It is the most common question patients ask on the way out: how long will this last? This guide explains what is happening, how long dental numbness normally takes to wear off, what changes the timing, how to stay safe while you wait, and the small number of signs that mean it is worth ringing your dentist.
How long does dental numbness last?
Most soft tissue numbness from a dental local anaesthetic wears off within about two to five hours. The lip, cheek and tongue tend to stay numb longest, while numbness inside the treated tooth fades sooner. A lower jaw injection generally lasts longer than an upper tooth injection, which is why your bottom lip can feel heavy well into the afternoon after a morning appointment.
NHS.uk describes a local anaesthetic as working "by stopping your nerves sending pain signals to your brain", and notes that its effects "usually get better within a few minutes or hours" [1]. That qualitative wording is deliberate. The exact time varies from person to person and depends on the injection, the drug used and your own body, so no dentist can promise you a precise minute it will end.
For an idea of the shorter end, the numbness inside the tooth, called pulpal anaesthesia, is what lets the dentist work painlessly, and it does not last as long as the outward numbness of the lip and tongue. Studies measuring a standard lower jaw injection have found pulpal anaesthesia typically lasts a little over an hour, and up to roughly two hours with a longer-acting anaesthetic [8][9]. The soft tissue numbness you actually notice outlasts it, which is normal.
Why the lower jaw stays numb longer than the upper
The type of injection explains most of the difference in timing. Dentists use two broad approaches, and they behave differently.
An infiltration is a small injection placed next to the tooth being treated, used mainly for upper teeth because the upper jawbone is porous enough for the anaesthetic to soak through to the nerve endings [7]. Only that tooth and a small patch of gum and lip go numb, so the effect is more contained and often shorter.
A nerve block is placed further back, bathing a whole nerve trunk before it branches. It is used for the lower jaw, whose denser bone an infiltration cannot reliably reach [7]. The classic example is the inferior alveolar nerve block, which numbs an entire side of the lower jaw, and because a neighbouring nerve runs alongside it, the tongue and floor of the mouth usually go numb too. A much larger area is anaesthetised, so it takes longer to recover.
This is the honest answer to "why is my bottom lip still numb hours after a filling but my top lip was fine by lunchtime". It is not that anything went wrong. It is simply that the two injections do different jobs.
What affects how long numbness lasts
Several factors push the timing up or down, and knowing them takes the worry out of a long afternoon of numbness.
- The type of injection. A lower jaw nerve block numbs more tissue for longer than an upper tooth infiltration [7].
- The anaesthetic used. UK dentists use several, including lidocaine (also spelled lignocaine), articaine, prilocaine and mepivacaine. In head-to-head trials, articaine tends to give longer numbness inside the tooth than plain lidocaine [8].
- Whether it contains adrenaline. Most dental cartridges include a small amount of adrenaline (epinephrine) or a similar agent. The NHS Specialist Pharmacy Service explains these vasoconstrictors "reduce local blood flow, slow the rate of absorption and prolong the anaesthetic effect" [5]. In plain English, the adrenaline narrows the blood vessels around the injection so the anaesthetic stays put and works for longer instead of being carried away in the bloodstream.
- Your medical history. Your dentist may choose a version without adrenaline if you have certain heart conditions [5]. That option can wear off a little faster.
- The dose and your own metabolism. More anaesthetic, or a slower personal metabolism, can both stretch the timing out. This is why two people having the same treatment can recover at noticeably different rates.
In the UK, a local anaesthetic is given by a dentist or another appropriately trained, General Dental Council (GDC) registered dental professional, such as a dental therapist or hygienist with the right additional training. It is a prescription-only medicine, which is part of why it is administered so carefully.
Can you make dental numbness wear off faster?
There is no reliable way to speed up a dental anaesthetic at home. Time is what makes it wear off, and the numbness will fade on its own as your body clears the drug. NHS.uk's guidance on local anaesthesia gives no method for hurrying it along, only advice on staying safe while you wait [1]. Treat any online "trick" to reverse numbness quickly with caution, because none is NHS-endorsed.
A reversal injection does exist in principle. Phentolamine mesylate, sold as OraVerse, is designed to reverse the soft tissue numbness of the lip and tongue after a dental anaesthetic that contained a vasoconstrictor. In the UK it is not routinely available. The All Wales Therapeutics and Toxicology Centre, part of NHS Wales, records that it "cannot be endorsed for use within NHS Wales for reversal of soft tissue anaesthesia" [6]. So it is not something to request as standard. If the duration of numbness is a genuine problem for you, for example before an important event, the right move is to raise it with your dentist beforehand rather than to look for a quick fix afterwards.
The most useful thing you can do is simply give it time and avoid injuring the numb area, which is where the real risk lies.
Eating, drinking and staying safe while numb
The biggest practical danger of dental numbness is not the numbness itself but what you might do to yourself without feeling it. Because the nerves are muted, you will not notice biting your lip, cheek or tongue, or scalding your mouth on a hot drink, until the anaesthetic wears off and the damage is done.
The safest approach is to wait until the feeling has fully returned before eating anything that needs chewing, and to avoid hot food and drinks in the meantime. University Hospitals Sussex NHS Foundation Trust advises patients after an extraction that "soft and bland foods are advisable" and to "avoid eating anything hot until the numbness has worn away" [3]. That advice applies just as well after a filling or other treatment, not only extractions.
A few simple habits help:
- Stick to lukewarm drinks and soft food until sensation is back.
- Chew on the opposite side to the numb area if you must eat.
- Avoid biting, sucking or prodding the numb lip or cheek to "test" it.
- Take particular care with children, who are most at risk of hurting themselves.
If you have had a tooth out, our guide to what to eat after a tooth extraction covers the first day in more detail, and the wisdom teeth removal recovery guide sets out what to expect after lower wisdom tooth surgery specifically.
Children and numbness after the dentist
Children need closer supervision after a local anaesthetic, because the strange numb sensation is a novelty and there is no pain to stop them chewing on it. Lip, cheek and tongue biting is a recognised, common consequence.
One study of 320 children found that around 13%, roughly one in eight, experienced soft tissue trauma after a local anaesthetic, with the highest rate in the youngest children under four [10]. The same research notes that children may bite "out of curiosity associated with the unfamiliar sensation of being numb", or "inadvertently because no pain is felt" [10].
If a bite injury does happen, it is usually reassuring rather than alarming. Self-inflicted lip or cheek trauma of this kind is very rarely infected and normally heals on its own, and antibiotics are usually unnecessary [10]. Even so, contact the practice if there is significant swelling or soreness, or if it does not settle within a few days.
Practical steps for parents after a child's appointment: keep them close for the few hours the numbness lasts, remind them not to bite or suck the numb area, and keep food soft, cool and simple until the feeling comes back. Preparing them before the visit helps too, and our guide to a child's first dental visit covers how to set expectations.
When lingering numbness is a red flag
Ordinary numbness from a local anaesthetic always wears off within hours. Numbness that lasts much longer, or comes with other symptoms, is worth having checked. This is uncommon, and it is usually temporary even when it happens, but it is the one part of this topic where it is right to pick up the phone.
The clearest guidance comes from University Hospitals Sussex NHS Foundation Trust, which tells patients after an extraction: "If the numbness continues for a week or more, please contact the oral and maxillofacial surgery department" [3]. That week-long threshold is a far more useful marker than any same-day worry. A numb lip on the afternoon of your appointment is expected; a numb lip a week later is not.
Numbness or tingling that persists is most associated with lower wisdom tooth removal, where nerves sit close to the roots. NHS.uk lists "damage to nerves close to the tooth, causing numbness or tingling in your tongue, lips and chin" as a possible complication, and notes this "usually gets better but can last a few weeks or months" [2]. NHS inform Scotland describes the same nerve disturbance as "far less common than dry socket", adding that "in most cases, the damage is temporary, lasting for a few weeks or months", though rarely it can be permanent if a nerve is severely damaged [4].
Contact your dentist if:
- Numbness or tingling has not started to improve after about a week [3].
- The numb area is spreading or getting worse rather than better.
- Numbness comes with severe pain, swelling, a high temperature or a bad taste, which can point to infection [2].
- You notice a loss of taste, or trouble speaking or eating that does not fit the expected pattern.
NHS inform advises reporting "any excess bleeding, severe pain or any other unusual symptoms to your dentist or oral surgeon immediately" [4]. If you cannot reach your dentist and you are worried, NHS 111 can direct you to urgent dental care. Our emergency dentist guide explains how out-of-hours access works.
Frequently asked questions
How long does dental numbness last after a filling?
Numbness after a filling usually wears off within two to five hours. An upper tooth filling often recovers faster because it uses a small local injection, while a lower tooth filling uses a nerve block that numbs the whole side of the jaw and can leave the lip and tongue numb for longer. Individual timing varies.
Why is my lip still numb hours after the dentist?
A numb lip hours after treatment is normal, especially after work on a lower tooth. Lower jaw injections are nerve blocks that anaesthetise a large area including the lip, tongue and chin, so they take longer to wear off than the small injections used for upper teeth. It should ease within about five hours.
How can I make dental numbness go away faster?
There is no reliable home method to speed up a dental anaesthetic, and NHS guidance offers none. Time is what wears it off. A reversal injection exists but is not routinely available on the NHS. The safest approach is to wait, avoid hot food and drink, and take care not to bite the numb area.
Is it normal to still be numb the next day?
Numbness lasting into the next day is unusual and worth mentioning to your dentist, though it is not always serious. It is most likely after lower wisdom tooth removal, where nerve irritation can cause tingling or numbness that usually settles over weeks or months. Contact your dentist if it has not improved after about a week.
Can I eat while my mouth is still numb?
It is best to wait until feeling returns before eating anything that needs chewing. While numb you cannot feel yourself biting your lip, cheek or tongue, or burning your mouth on hot food or drink. Stick to soft, cool food, chew on the opposite side if you must eat, and supervise children closely.
When should I worry about numbness after a tooth extraction?
Contact your dentist or the oral surgery team if numbness continues for a week or more, if it is spreading or worsening, or if it comes with severe pain, swelling, fever or a bad taste. Most nerve disturbance after an extraction is temporary and resolves on its own, but lingering numbness should always be checked.
Who is allowed to give a dental anaesthetic in the UK?
A local anaesthetic is given by a dentist or another appropriately trained, GDC-registered dental professional, such as a dental therapist or hygienist with the relevant additional training. It is a prescription-only medicine, given under strict rules, which is one reason it is administered so carefully and in measured doses.
The short version
Dental numbness is a sign the anaesthetic did its job, and for the overwhelming majority of appointments it fades quietly within a few hours. Give it time, keep hot drinks and chewing until the feeling is back, watch children a little more closely, and only reach for the phone if numbness is lasting far longer than a day or is getting worse rather than better.
When you are ready to book your next check-up or treatment, you can search for a dentist near you on Dentists Closeby and compare the practices covering your area. If cost is on your mind, our guide to NHS dental charges explains the current bands, and our dental filling cost guide sets out NHS and private prices for the most common reason people end up numb in the first place.
Sources
- Local anaesthesia -- NHS.uk, last reviewed 17 December 2025, accessed 2026-08-12
- Wisdom tooth removal -- NHS.uk, last reviewed 12 June 2024, accessed 2026-08-12
- Care of the mouth after dental extractions under local anaesthetic -- University Hospitals Sussex NHS Foundation Trust, last reviewed 30 July 2024, accessed 2026-08-12
- Wisdom tooth removal -- NHS inform (Scotland), last updated 26 March 2025, accessed 2026-08-12
- Managing reactions to dental local anaesthetic injections -- NHS Specialist Pharmacy Service, last updated 30 July 2024, accessed 2026-08-12
- Phentolamine mesylate (OraVerse) -- All Wales Therapeutics and Toxicology Centre, NHS Wales, issued 1 May 2012, accessed 2026-08-12
- Local Anesthesia Techniques in Dentistry and Oral Surgery -- StatPearls, NCBI Bookshelf, accessed 2026-08-12
- Onset and Duration Period of Pulpal Anesthesia of Articaine and Lidocaine in Inferior Alveolar Nerve Block -- Brazilian Dental Journal, via PubMed, accessed 2026-08-12
- Articaine and mandibular anaesthesia duration study -- PMC, National Library of Medicine, accessed 2026-08-12
- Soft tissue trauma after local anaesthesia in children (review citing College et al.) -- PMC, National Library of Medicine, accessed 2026-08-12
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