Dental numbness from local anesthesia typically lasts 1 to 3 hours for the lips, cheeks, and tongue, though it can stretch closer to 4 or 5 hours depending on the type of anesthetic used and where it was injected. The tooth itself loses its numbing faster, often within about 90 minutes, but the surrounding soft tissue stays numb much longer because the anesthetic takes more time to clear from those areas.
Typical Duration by Anesthetic Type
The most common dental anesthetic, lidocaine with epinephrine, numbs the tooth pulp for roughly 85 minutes and keeps the surrounding soft tissue numb for about 180 minutes (3 hours). That soft tissue numbness is what you actually feel in your lip, tongue, or cheek after leaving the office.
Articaine, another widely used option, tends to last longer. In studies comparing the two, lidocaine’s total anesthetic effect averaged about 175 minutes while articaine averaged 231 minutes, roughly 3.5 to 4 hours. Some patients in those studies stayed numb for over 5 hours with articaine. Shorter-acting anesthetics like mepivacaine and prilocaine (often used without epinephrine) are sometimes chosen for simpler procedures, but research has found their soft tissue duration is surprisingly similar to lidocaine with epinephrine in many cases.
Why Epinephrine Makes It Last Longer
Most dental anesthetic solutions include epinephrine, a vasoconstrictor that tightens the blood vessels around the injection site. This keeps the anesthetic concentrated in the area rather than letting blood flow carry it away. The result is deeper, longer-lasting numbness, which is exactly what your dentist wants during a procedure. The tradeoff is that numbness lingers longer afterward, because the same mechanism that kept the drug in place continues working even after the procedure is done.
What Affects How Quickly It Wears Off
Several factors influence whether you’re on the shorter or longer end of that range. The location of the injection matters most. A nerve block in the lower jaw (used for molars and wisdom teeth) tends to produce wider, longer-lasting numbness than a small injection in the upper gum. Lower jaw blocks numb the entire side of your lip, chin, and tongue, and that broader area simply takes more time to recover.
Your own metabolism plays a role too. Lidocaine is broken down primarily by the liver, and people with slower liver metabolism may stay numb longer. Articaine works differently: over 90% of it is broken down by enzymes in the blood and tissues themselves, which is why it clears the body faster despite producing longer local numbness. Higher doses, multiple injections, or re-injection during a long procedure will also extend the timeline.
A Reversal Agent Can Cut the Time in Half
If the lingering numbness is a significant concern, there is a reversal injection your dentist can give. This drug (sold as OraVerse) works by blocking epinephrine’s vessel-tightening effect at the injection site. Once those blood vessels relax and open up, blood flow increases and carries the anesthetic out of the tissue much faster.
In a study of children aged 6 to 11, the reversal injection cut median lip recovery time from 135 minutes down to 60 minutes. It’s not routinely offered, but you can ask your dentist about it before your procedure, especially if you have a meeting, a meal, or another reason you’d rather not be numb for hours afterward.
Eating and Drinking While Still Numb
The biggest practical risk while your mouth is numb is accidentally biting your cheek, tongue, or lip without realizing it. This is especially common in children, who may chew on their numb lip out of curiosity and end up with a painful sore once the feeling returns. Adults are not immune to this either.
Avoid eating until the numbness has worn off enough that you can feel your teeth coming together. If you do eat, stick to soft foods on the opposite side of your mouth. Hot beverages are another hazard: you can burn the numb tissue without feeling it. Let coffee, tea, and soup cool to a comfortable temperature before drinking, particularly in the first few hours after your procedure.
When Numbness Lasts Too Long
If your numbness hasn’t faded at all after 5 to 6 hours, or if it persists into the next day, contact your dentist. Prolonged numbness can occasionally signal nerve irritation from the injection or the procedure itself. This is called paresthesia, and it shows up as lingering numbness, tingling, or a burning sensation in the lip, chin, or tongue.
Paresthesia occurs in roughly 0.35% to 8.4% of patients after procedures like wisdom tooth removal, with the wide range depending on the complexity of the surgery. The good news is that most cases resolve on their own within the first six months. Permanent sensory changes are rare, reported at about 0.12% of cases. If you notice numbness that outlasts what your dentist described as normal, getting it evaluated early gives you the best information about what to expect during recovery.