Most gum sores heal on their own within two weeks, but the right treatment can cut down on pain and speed things along. What works best depends on the type of sore you’re dealing with and what caused it. The good news is that the most common gum sores, canker sores, respond well to simple at-home care.
Identify What You’re Dealing With
The most common gum sores are canker sores (aphthous ulcers), small round or oval ulcers that appear inside the mouth. They’re not contagious and typically show up after minor trauma like biting your cheek, eating acidic foods, or experiencing stress. Some people get them from dental work, braces, or even harsh toothpaste. Nutrient deficiencies in vitamin B12, iron, or folate can also trigger them.
Cold sores are different. They’re caused by a virus, they’re contagious, and they usually appear on or around the lips rather than on the gums. If your sore is a fluid-filled blister on the outside of your mouth, you’re likely dealing with a cold sore, which requires antiviral treatment rather than the strategies below.
Gum sores can also result from physical irritation: a rough edge on a filling, an ill-fitting denture, or brushing too hard. And in rarer cases, recurring mouth ulcers point to underlying conditions like celiac disease, Crohn’s disease, or lupus.
Salt Water Rinse
A warm salt water rinse is the simplest and most effective first step. Mix half a teaspoon of salt into one cup of warm (not hot) water and swish gently for 30 seconds before spitting it out. Do this once or twice a day, ideally after meals or brushing. Salt water draws fluid from the swollen tissue, reduces bacteria around the sore, and creates an environment that supports healing. It won’t sting as badly as you might expect, though the first few seconds can be uncomfortable on an open ulcer.
Over-the-Counter Pain Relief
Topical gels containing benzocaine numb the sore on contact, making it easier to eat and talk. You apply a small amount directly to the sore with clean hands. The numbness is temporary, usually lasting 15 to 30 minutes, so timing it before meals helps the most. Avoid chewing gum or eating hard foods while the area is still numb, since you could accidentally bite the tissue and make things worse.
Benzocaine products should not be used on children under 2 years old, as they carry a risk of a rare but serious blood condition. Adults with heart disease, lung conditions like asthma, or a history of allergic reactions to local anesthetics should check with a pharmacist before using them.
Protective pastes and patches are another option. These create a physical barrier over the sore, shielding it from food, drinks, and friction while it heals. Some contain mild antiseptics or anti-inflammatory ingredients.
Honey as a Natural Alternative
If you prefer something more natural, plain honey applied directly to the sore has real clinical backing. In a randomized study comparing honey to a prescription-strength corticosteroid paste, both treatments produced nearly identical results. Honey reduced ulcer size by 59% within four days, and sores fully resolved by day seven. The prescription paste showed a 61% reduction over the same period, with the same complete healing timeline. Applying a small amount of honey to the sore three times a day is a reasonable approach, especially if you don’t have access to medicated products.
Prescription Options for Severe Sores
When over-the-counter treatments aren’t enough, dentists and doctors can prescribe a corticosteroid dental paste. This reduces inflammation in the tissue directly at the sore site, helping it shrink faster and hurt less. The paste is applied directly to the ulcer and sticks to the moist tissue. It’s typically reserved for larger sores, ones that keep coming back, or sores that haven’t responded to simpler treatments.
For cold sores that spread to the gum tissue, antiviral medications are the standard treatment. These work best when started at the first tingling sensation, before the blister fully forms.
Switch Your Toothpaste
If you get canker sores frequently, your toothpaste may be part of the problem. Many commercial toothpastes contain sodium lauryl sulfate (SLS), a foaming agent that strips away the protective mucus layer lining your mouth. With that barrier compromised, the tissue underneath is directly exposed to irritants.
The evidence here is compelling. In one study, patients who switched from an SLS-containing toothpaste to an SLS-free version saw their canker sore count drop from an average of 14.3 ulcers over three months to just 5.1, a 64% reduction from a single product swap. A 2019 systematic review of four clinical trials involving 124 participants confirmed the pattern: SLS-free toothpaste consistently reduced the number of ulcers, how long each one lasted, and how much they hurt. Checking your toothpaste ingredients and switching to an SLS-free brand is one of the highest-impact changes you can make.
Brush Gently With a Soft Bristle Brush
Toothbrush trauma is a surprisingly common cause of gum sores, and it’s entirely preventable. Medium and hard bristle brushes remove plaque effectively but carry a higher risk of damaging gum tissue and wearing down enamel. Even a soft brush can cause problems if you press too hard. The goal is gentle, consistent strokes rather than aggressive scrubbing. If you notice your gum sores tend to appear in spots where your brush hits the tissue, switching to a soft or extra-soft brush and easing up on pressure is worth trying before anything else.
Check for Nutritional Gaps
Recurring gum sores that don’t have an obvious trigger, like trauma or irritation, sometimes point to a nutritional deficiency. Low vitamin B12 is one of the more common culprits. B12 deficiency can cause mouth ulcers on the gums or tongue, along with fatigue and other symptoms. Adults need about 2.4 micrograms of B12 daily, which most people get from meat, fish, eggs, and dairy. If you follow a plant-based diet or have absorption issues, supplementation or fortified foods can close the gap.
Iron and folate deficiencies are also linked to recurrent canker sores. A simple blood test can identify whether a deficiency is driving your symptoms, and correcting it often reduces how frequently sores appear.
When Gum Sores Need Professional Attention
Most gum sores resolve within two weeks without any treatment at all. If yours lasts longer than that, it needs to be evaluated. A sore that won’t heal is one of the recognized signs of oral cancer, along with white or reddish patches inside the mouth, unexplained lumps, loose teeth, persistent mouth or ear pain, and difficulty swallowing. Any of these symptoms persisting beyond two weeks warrants a visit. A dentist or doctor can examine the area and, if something looks abnormal, take a small tissue sample for testing.
You should also seek care sooner if a gum sore is unusually large, extremely painful, spreading, accompanied by a high fever, or making it difficult to drink fluids. Multiple sores appearing at once or sores that keep coming back every few weeks can signal an underlying health condition that’s worth investigating.