Swollen gums near a wisdom tooth are almost always caused by a condition called pericoronitis, where the flap of gum tissue covering a partially erupted tooth traps food and bacteria underneath. Mild cases clear up in a few days with home care, while more severe infections can take several weeks. Here’s how to manage the swelling and know when you need professional help.
Why the Gum Swells in the First Place
When a wisdom tooth only partially breaks through the gum line, a pocket forms between the tooth and the overlying tissue. Food particles, plaque, and bacteria collect in that pocket easily, but they’re nearly impossible to clean out with a normal toothbrush. The trapped debris triggers inflammation, and if bacteria multiply enough, a full infection develops.
This is especially common in lower wisdom teeth because the angle of eruption tends to leave more gum tissue draped over the biting surface. Biting down on that swollen flap with the upper tooth makes things worse, creating a cycle of irritation and reinfection that can keep flaring up until the underlying cause is addressed.
At-Home Treatment for Mild Swelling
If the swelling just started and you don’t have a fever or trouble opening your mouth, you can often bring it under control at home.
Saltwater rinses are the simplest and most effective first step. Mix 1 teaspoon of salt into 8 ounces of warm water and swish gently around the affected area for 30 seconds, then spit. If the area is very tender, cut the salt to half a teaspoon for the first day or two. Repeat this three to four times daily, especially after meals.
Pain and inflammation control works best when you combine two types of over-the-counter pain relievers. Ibuprofen reduces both pain and swelling, while acetaminophen adds pain relief through a different mechanism. Combination tablets are available (250 mg acetaminophen plus 125 mg ibuprofen per tablet, two tablets every 8 hours, no more than six per day). If you’re taking them separately, just be careful not to exceed 4,000 mg of acetaminophen in 24 hours.
Gentle cleaning under the flap is the part most people skip, but it matters the most. Use a curved-tip oral irrigation syringe (available at most pharmacies) filled with warm saltwater to flush debris out from under the gum flap. You can also angle a soft-bristled toothbrush or an interdental brush along the gum line to dislodge trapped food. This is uncomfortable but prevents reinfection better than rinsing alone.
Cold compresses on the outside of the jaw, 15 minutes on and 15 minutes off, help with swelling in the first 24 to 48 hours. Avoid chewing on that side, and stick to softer foods until the inflammation calms down.
When You Need Professional Treatment
If home care doesn’t improve things within two or three days, or if the swelling gets noticeably worse, a dentist can intervene more directly. Professional treatment typically starts with irrigating the pocket under the gum flap to flush out bacteria and debris more thoroughly than you can at home.
For infections that have taken hold, dentists prescribe antibiotics. The two most effective options for this type of infection are metronidazole (400 mg three times daily for up to five days) and amoxicillin (500 mg every eight hours for up to five days). These target the specific anaerobic bacteria that thrive in the low-oxygen environment under the gum flap. You’ll typically notice improvement within 48 hours of starting antibiotics, though you need to finish the full course.
Signs the Infection Is Spreading
Most pericoronitis stays localized, but certain symptoms signal that infection is moving into deeper tissues and needs urgent care:
- Difficulty opening your mouth. When jaw muscles stiffen and your mouth won’t open fully, it means the infection or swelling has reached the surrounding muscle tissue. This is called trismus, and it can make eating, speaking, and even cleaning your teeth difficult.
- Fever or chills. A temperature above 100.4°F suggests your body is fighting a systemic infection, not just local inflammation.
- Swelling extending to the neck, cheek, or under the jaw. Visible swelling beyond the gum itself points to infection spreading through the tissue planes of the face and neck.
- Difficulty swallowing or breathing. This is rare but represents a dental emergency. Severe swelling near the airway requires immediate treatment.
Longer-Term Solutions
Treating the swelling handles the immediate problem, but if the gum flap is still there, pericoronitis tends to come back. There are two main options to prevent recurrence, and which one your dentist recommends depends on the condition of the wisdom tooth itself.
If the wisdom tooth is healthy, positioned correctly, and just needs the gum to get out of the way, a procedure called an operculectomy removes the flap of tissue covering the tooth. It’s a minor procedure, and once the tissue is gone, food and bacteria lose their hiding spot. Recovery is straightforward.
Extraction is the better choice when the wisdom tooth is impacted (angled or stuck beneath bone), decayed, or pushing against neighboring teeth. Removing the tooth eliminates the problem permanently. Recovery from wisdom tooth extraction typically takes one to two weeks, with the most discomfort in the first three to four days.
Keeping the Area Clean While It Heals
The biggest factor in how quickly pericoronitis resolves is how well you keep the area clean during recovery. With treatment, mild cases clear up in a few days, and even moderate infections usually resolve within one to two weeks. But neglecting hygiene around the gum flap is the main reason people end up with repeated flare-ups.
After each meal, flush the area with a saltwater rinse or an irrigation syringe. Brush the rest of your teeth normally, and use the softest brush you have around the wisdom tooth area. Avoid mouthwashes with alcohol, which can irritate inflamed tissue. If you notice the swelling returning after it had improved, get back to aggressive rinsing before it has a chance to progress into another full infection.