Most ulcers on the gums heal on their own within one to two weeks, but you can speed that process and cut the pain significantly with a combination of home care and over-the-counter products. The key is starting treatment early, keeping the area clean, and knowing when a sore that won’t go away needs professional attention.
Start With a Saltwater or Baking Soda Rinse
The simplest and cheapest first step is a saltwater rinse. Mix one teaspoon of salt into half a cup of warm water and swish it around your mouth for about 30 seconds. The salt helps disinfect the ulcer and reduces inflammation. You can do this two to three times a day, especially after meals.
Baking soda works differently but is equally useful. Combine a small amount of baking soda with just enough water to form a thick paste, then dab it directly onto the ulcer. Baking soda neutralizes the acids in your mouth that irritate the sore, which takes some of the sting out almost immediately. You can also dissolve a teaspoon of baking soda in water and use it as a rinse if applying paste feels too uncomfortable.
Over-the-Counter Gels and Rinses
If home rinses aren’t giving you enough relief, pharmacy products with numbing or antiseptic ingredients can help. Look for gels or pastes containing benzocaine (sold as Anbesol, Orabase, or Zilactin-B), which numb the surface of the ulcer so you can eat and talk more comfortably. Hydrogen peroxide rinses, like Peroxyl, clean the area and help prevent secondary infection.
Topical numbing agents typically reduce pain by about 48% within 10 minutes of application. The relief from basic numbing gels like lidocaine tends to fade within a couple of hours, so you may need to reapply several times a day. For best results, apply these products as soon as you notice the ulcer forming, before it has a chance to grow larger.
What Your Dentist Can Do for Stubborn Ulcers
For ulcers that are large, unusually painful, or keep coming back, a dentist or doctor can prescribe stronger options. Prescription steroid pastes reduce inflammation at the site. In clinical comparisons, both common prescription steroids showed statistically significant reductions in pain, size, and number of ulcers within seven days. You apply the paste after meals, then avoid food and water for 30 minutes so it stays in contact with the sore.
Two in-office treatments can also help. A low-powered dental laser relieves pain almost immediately and may prevent the ulcer from returning in the same spot. Chemical cauterization with silver nitrate (a small medicated stick touched to the sore) also provides pain relief, though it’s generally less effective than laser treatment.
Why You Keep Getting Gum Ulcers
Treating individual ulcers is only half the battle if they keep reappearing. Recurrent gum ulcers are commonly linked to nutritional deficiencies, particularly low levels of vitamin B12, iron, folic acid, and vitamin C. In documented cases, patients with recurring ulcers who were found to be deficient in B12 experienced complete recovery after supplementation, with no recurrence at six months. If you’re getting ulcers frequently, a blood test to check these levels is worth pursuing.
Other common triggers include physical irritation from braces, sharp tooth edges, or aggressive brushing. Stress and hormonal changes also play a role. Some people suspect the foaming agent in toothpaste (sodium lauryl sulfate) causes ulcers, but a controlled study comparing SLS-free toothpaste to regular toothpaste found no significant difference in ulcer frequency, size, or duration. Switching toothpaste is unlikely to help.
Practical Tips While You Heal
What you eat and drink during the healing window matters more than most people realize. Acidic foods like citrus fruits, tomatoes, and vinegar-based dressings directly irritate the ulcer and can extend healing time. Spicy food and very hot drinks do the same. Stick to softer, cooler, blander foods until the sore closes up.
Avoid poking or prodding the ulcer with your tongue or fingers. Use a soft-bristled toothbrush and be gentle around the affected area. If the ulcer is in a spot where a tooth or dental appliance keeps rubbing against it, orthodontic wax (available at any pharmacy) can create a temporary barrier.
When a Gum Ulcer Needs Medical Attention
A typical gum ulcer is small, round, and shallow with a whitish or yellowish center and a red border. It hurts, but it heals. The warning signs that something more serious is going on include any sore that lasts longer than two weeks, a sore that keeps growing instead of shrinking, unexplained loose teeth, a persistent lump or thickened area, difficulty swallowing, or ear pain. These can be symptoms of oral cancer or other conditions that require a biopsy to diagnose.
A dentist can examine the ulcer visually and, if anything looks abnormal, take a small tissue sample to test. A clinical oral exam remains the foundation for early detection of serious oral conditions, so don’t skip it if a sore isn’t behaving like a normal ulcer.