Most mouth sores heal on their own within two weeks, but the right combination of home treatments can cut that time roughly in half and significantly reduce pain in the meantime. The fastest approach depends on what type of sore you’re dealing with, since canker sores and cold sores require completely different strategies.
First, Identify What You’re Dealing With
Canker sores appear inside your mouth, usually on the inner cheeks, lips, or tongue. They look like a single round white or yellow sore with a red border. They’re not contagious, and their exact cause isn’t fully understood, though injuries (like biting your cheek), stress, and nutritional deficiencies can trigger them.
Cold sores (fever blisters) show up on the outside of your mouth, around your lips. They appear as a cluster of small, fluid-filled blisters caused by the herpes simplex virus. The virus lives in your nerve cells and reactivates periodically. Cold sores require antiviral treatment, not the remedies below. If you have blisters on or around your lips, an antiviral cream or prescription antiviral medication started within the first 48 hours will shorten the outbreak most effectively.
Everything that follows focuses on canker sores, which are what most people mean when they search for mouth sore relief.
Saltwater and Baking Soda Rinses
A simple rinse is one of the fastest things you can do right now to start healing. Memorial Sloan Kettering Cancer Center recommends mixing 1 teaspoon of salt and 1 teaspoon of baking soda into 1 quart (4 cups) of water. You can also use just salt or just baking soda if that’s what you have on hand. Rinse every 4 to 6 hours, or more often if the pain is bothering you.
Salt draws fluid out of inflamed tissue, which reduces swelling. Baking soda helps neutralize acids in your mouth that irritate the open sore. Together, they create a cleaner environment that lets the tissue repair itself faster. This is the single most accessible and well-supported home remedy, and you can start it immediately.
Honey Works as Well as Prescription Options
If you want something more active than a rinse, honey is surprisingly effective. A randomized clinical trial published in the Brazilian Journal of Oral Sciences found that a honey-lemon spray applied four times daily healed canker sores in about 5 days on average, which was comparable to a prescription-strength steroid ointment (about 4.5 days). Pain relief was also similar between the two groups.
You don’t need a special spray. Dabbing a small amount of raw honey directly onto the sore several times a day, particularly before meals and before bed, provides the same protective coating and antibacterial benefit. Honey sticks to the tissue, shields it from further irritation, and has natural anti-inflammatory properties. Manuka honey is often recommended, but the study used regular honey with lemon and still matched prescription results.
Over-the-Counter Products That Help
Pharmacy shelves have several options that target mouth sores directly. The most useful fall into two categories: numbing agents and protective barriers.
- Numbing gels and liquids containing benzocaine coat the sore and block pain for 30 to 60 minutes. These are most useful right before eating so you can get through a meal without wincing. Apply them directly to the sore with a clean finger or cotton swab.
- Protective pastes form a bandage-like layer over the ulcer, shielding it from food, drinks, and your teeth. These can reduce irritation throughout the day and may help the sore heal faster by preventing repeated trauma to the area.
Avoid mouthwashes that contain alcohol. Alcohol dries out and irritates already damaged tissue. Look for alcohol-free and sugar-free options if you want a commercial rinse.
You might also see hydrogen peroxide recommended as a mouth rinse. Be cautious here. A 3% hydrogen peroxide solution (the standard drugstore concentration) used multiple times daily has been shown to cause mucosal irritation, especially when oral tissue is already damaged. If you use it at all, dilute it with equal parts water and limit it to once or twice a day.
What to Avoid While Healing
What you stop doing matters almost as much as what you start doing. Acidic foods like tomatoes, citrus, and vinegar-based dressings will sting and slow healing. Spicy foods, crunchy chips, and crusty bread can physically reinjure the sore. Hot beverages irritate the tissue more than warm or cool ones.
If you use a toothpaste containing sodium lauryl sulfate (SLS), consider switching temporarily. SLS is a foaming agent that can irritate oral tissue and is a known trigger for recurrent canker sores in some people. SLS-free toothpastes are widely available and easy to find.
When Sores Keep Coming Back
Occasional canker sores are common and not a sign of anything serious. But if you’re getting them frequently, a nutritional deficiency may be the underlying cause. Deficiencies in vitamin B12, folic acid, iron, and zinc are all clinically linked to recurrent mouth ulcers. Vitamin B12 deficiency alone can cause recurrent ulcers, tongue inflammation, cracking at the corners of the mouth, and burning sensations. Iron deficiency shows up as chronic tongue soreness and pale oral tissue.
Zinc plays a key role in immune function and tissue repair, and lower zinc levels are associated with a higher rate of oral mucosal diseases. If your sores come back every few weeks or take longer than two weeks to heal, it’s worth asking for blood work to check these levels. Correcting a deficiency can stop the cycle entirely.
Prescription Options for Severe Sores
Most canker sores respond well to home care, but large or especially painful ones sometimes need more. Prescription topical steroid ointments reduce inflammation, ease pain, and can shorten healing time. These are typically the first step a dentist or doctor will try.
For sores that are very large or not responding to other treatment, laser therapy or electrocauterization can eliminate bacteria in the area, reduce pain almost immediately, and accelerate healing. These are quick in-office procedures, not surgeries.
Red Flags That Need Attention
A mouth sore that hasn’t healed after three weeks warrants a professional evaluation. Cancer Research UK notes that an unexplained mouth ulcer lasting more than three weeks is grounds for an urgent specialist referral. The same applies to any sore accompanied by a lump in the neck, persistent one-sided throat pain, difficulty swallowing, or red and white patches in the mouth that weren’t there before. These symptoms don’t automatically mean something serious, but they should be checked promptly rather than watched and waited on.