Numbness from dental anesthesia after wisdom teeth removal typically lasts 3 to 5 hours, though it can stretch longer depending on the type of anesthetic your oral surgeon used and where it was injected. The lower jaw tends to stay numb longer than the upper jaw because the nerve block used for lower teeth affects a larger area, including your lip, tongue, and chin.
Why It’s Probably Not Novocaine
Despite the name everyone uses, true novocaine (procaine) has been largely phased out of dental practice. Most dentists and oral surgeons now use lidocaine or articaine for routine procedures, and some use a longer-acting anesthetic called bupivacaine specifically for wisdom teeth extractions to help with pain control after surgery. These newer anesthetics are more effective, last longer, and cause fewer allergic reactions than procaine ever did. So when you hear “novocaine,” your dentist almost certainly gave you something else.
Typical Numbness Timeline
Lidocaine with epinephrine, the most commonly used combination, produces numbness that lasts roughly 3 to 4.5 hours. In clinical measurements, soft tissue numbness from this combination averages about 228 minutes (just under 4 hours), with a range from about 2.5 to 4.5 hours. Epinephrine is a vasoconstrictor mixed in with the anesthetic to narrow blood vessels at the injection site, which slows how quickly the anesthetic gets absorbed into your bloodstream and extends the effect.
If your surgeon used bupivacaine, a longer-acting option often chosen for wisdom tooth procedures, you can expect numbness to last 5 to 8 hours. Bupivacaine is particularly useful for lower wisdom teeth extractions because it provides better pain control in the immediate hours after surgery, giving you a window before you need to rely on pain medication.
Upper wisdom teeth generally involve anesthesia that wears off faster, often within 2 to 3 hours, because the bone in the upper jaw is more porous and the anesthetic doesn’t need to travel as far to reach the nerve. Lower wisdom teeth require a deeper nerve block (an inferior alveolar nerve block) that numbs a much wider area and takes longer to clear your system.
Why Duration Varies From Person to Person
Several factors influence how quickly the numbness fades. Your body breaks down amide-type anesthetics (the category that includes lidocaine and bupivacaine) through the liver, so anything affecting liver function or blood flow can change the timeline. People with faster metabolisms tend to process the drug more quickly.
Inflammation and infection at the surgical site also matter. When tissue is inflamed or infected, the local pH drops, making the environment more acidic. This shifts the balance of anesthetic molecules toward a form that doesn’t cross nerve membranes as easily, which can make the initial anesthesia less effective but doesn’t necessarily shorten how long residual numbness lasts. The amount of anesthetic injected plays a role too. Wisdom teeth extractions, especially surgical ones involving impacted teeth, often require more anesthetic than a simple filling, which means a larger dose to metabolize and a longer period of numbness.
Other individual factors include your weight, age, and how well your blood circulates to the area. Younger patients with good circulation tend to clear the anesthetic a bit faster.
What Stays Numb and What Wears Off First
Numbness doesn’t disappear all at once. The teeth and bone typically regain sensation first, followed by the cheeks and gums, with the lips and tongue being the last to recover. This is because the anesthetic was injected near the nerve trunk and wears off in reverse order from the injection site outward.
You’ll likely notice a tingling or “pins and needles” sensation as feeling returns. This is normal and a sign the anesthetic is wearing off. Full sensation usually comes back gradually over 30 to 60 minutes once the process starts.
Eating and Drinking While Still Numb
Most oral surgeons recommend waiting to eat until the numbness has fully worn off. The reason is straightforward: when you can’t feel your lips, cheeks, or tongue, you’re likely to bite them without realizing it, and those injuries can be surprisingly painful once sensation returns. You can also burn yourself with hot food or drinks because you won’t register the temperature.
If you’re hungry before the numbness fades, stick to cool or room-temperature liquids like smoothies, broth, or yogurt that don’t require chewing. Avoid using a straw, since the suction can disturb the blood clot forming in the extraction site. Once you can feel your lips and tongue again, you can move on to soft foods like mashed potatoes, scrambled eggs, or applesauce.
When Numbness Lasts Too Long
If you’re still completely numb after 8 hours, or if numbness persists into the next day, contact your oral surgeon. Prolonged numbness can occasionally result from nerve irritation or injury during the extraction, particularly with lower wisdom teeth that sit close to the inferior alveolar nerve. In most of these cases, the sensation returns on its own over days to weeks as the nerve heals. Permanent nerve damage is rare but possible, occurring in roughly 1% or fewer of wisdom tooth extractions.
Partial numbness that lingers for a few days, especially a tingling sensation in the lower lip or tongue, is more common and usually resolves without treatment. A complete absence of sensation that doesn’t improve at all within a week warrants a follow-up visit.