If you deal with canker sores regularly, knowing how to get rid of canker sores quickly can save you days of misery. This blog shares 10 dentist-backed methods that actually work, plus tips to prevent them from coming back.
What Are Canker Sores and Why Do They Hurt So Much?
Canker sores are small, shallow ulcers that appear inside your mouth. They show up on your inner cheeks, tongue, gums, or the roof of your mouth. Unlike cold sores, canker sores are not contagious and do not appear on your lips.
They hurt so much because the ulcer exposes raw nerve endings. Every time food, drinks, or even your tongue touches the sore, those nerves fire pain signals. Even though canker sores are tiny, the pain can make eating and talking feel impossible.
What Causes Canker Sores?
Doctors are not completely sure why some people get canker sores and others do not. However, common triggers include:
- Accidentally biting your cheek or tongue
- Sharp tooth edges or rough dental work
- Brushing too hard with a stiff toothbrush
- Stress and lack of sleep
- Acidic or spicy foods (citrus, tomatoes, hot peppers)
- Vitamin deficiencies, especially B12, iron, or folate
- Hormonal changes during periods
- Certain health conditions like Celiac disease or Crohn's disease
Understanding what triggers your canker sores helps you avoid them in the future. If you get them constantly, a dentist like Dr. Nidhi Nangia can check for sharp teeth, ill-fitting dental work, or other mouth issues making things worse.
How Long Do Canker Sores Last?
| Type | Size | Healing Time |
|---|---|---|
| Minor canker sores | Small (under 1cm) | 7-14 days |
| Major canker sores | Large (over 1cm) | 2-6 weeks |
| Herpetiform canker sores | Tiny clusters (10-100 sores) | 1-2 weeks |
Most people get minor canker sores that heal within 10 days. If your sore lasts longer than three weeks or keeps getting bigger, see a dentist or doctor right away.
10 Ways to Get Rid of Canker Sores
1. Salt Water Rinse (The Classic That Works)
Salt water is one of the oldest and most effective ways to get rid of canker sores. Salt reduces bacteria and calms inflammation, which speeds up healing.
Mix half a teaspoon of salt into a glass of warm water. Swish it around your mouth for 30 seconds, then spit it out. Do this three to four times a day, especially after meals.
Yes, it stings for a few seconds. But that sting means it is working to clean the sore and reduce swelling.
2. Baking Soda Paste (Neutralize Acid)
Baking soda balances the pH in your mouth, making it less acidic. This helps canker sores heal faster because acid irritates the ulcer.
Mix one teaspoon of baking soda with just enough water to make a thick paste. Use a cotton swab to apply it directly to the canker sore. Let it sit for five to ten minutes, then rinse your mouth with water.
You can also make a baking soda rinse by mixing one teaspoon into half a cup of warm water and swishing it around your mouth.
3. Hydrogen Peroxide Solution (Disinfect Fast)
Hydrogen peroxide kills bacteria and helps canker sores heal by keeping the area clean. Always dilute it before using it in your mouth.
Mix equal parts 3% hydrogen peroxide and water. Dip a cotton swab into the mixture and dab it gently on the canker sore. You can also swish the diluted solution in your mouth for 30 seconds.
Do not swallow hydrogen peroxide. Use this method two to three times a day maximum.
4. Honey (Natural Healing Power)
Raw honey, especially Manuka honey, has natural antibacterial and anti-inflammatory properties. It soothes pain and speeds up healing for canker sores.
Apply a small amount of honey directly to the sore using a clean finger or cotton swab. Leave it on as long as possible. Repeat three to four times daily, especially before bed.
5. Over-The-Counter Gels and Patches
Pharmacies sell gels and patches specifically designed to treat canker sores. These products numb the pain and create a protective barrier over the ulcer.
- Benzocaine gels: Numb the area for quick pain relief
- Amlexanox paste: Speeds healing and reduces inflammation
- Canker sore patches: Stick over the sore to protect it while you eat and talk
Follow the instructions on the package. These treatments work best when applied right when the canker sore first appears.
6. Ice or Cold Foods (Instant Numbing)
Cold temperatures numb nerve endings and reduce swelling around canker sores. This gives you quick temporary relief.
Suck on ice chips, eat frozen fruit pops, or drink cold water. You can also hold an ice cube directly against the canker sore for a few seconds at a time.
This does not heal the sore faster, but it makes the pain bearable while other treatments work.
7. Avoid Trigger Foods (Stop Making It Worse)
Certain foods irritate canker sores and slow down healing. Avoid these until the sore is completely gone:
- Citrus fruits (oranges, lemons, grapefruits, tomatoes)
- Spicy foods and hot peppers
- Crunchy or sharp foods (chips, toast, crackers)
- Coffee, soda, and alcohol
Stick to soft, bland foods like yogurt, oatmeal, mashed potatoes, and smoothies. Your mouth will thank you.
8. Vitamin B12 and Other Supplements
If you get canker sores frequently, you might have a vitamin deficiency. Low levels of B12, folate, iron, or zinc can make you more likely to develop canker sores.
Consider taking a daily multivitamin or specific supplements if you suspect a deficiency. Talk to your doctor before starting any new supplement, especially if you have other health conditions.
Fixing the deficiency can reduce how often you get canker sores in the future.
9. Aloe Vera Gel (Soothing Natural Relief)
Pure aloe vera gel calms inflammation and helps canker sores heal faster. Make sure you use food-grade aloe vera, not the kind meant for sunburns.
Apply a small amount of gel directly to the canker sore two to three times a day. You can find food-grade aloe vera gel at most pharmacies or health stores.
10. Milk of Magnesia (Protective Coating)
Milk of magnesia neutralizes acid in your mouth and creates a protective coating over canker sores. This reduces pain and speeds healing.
Swish a small amount in your mouth or dab it directly onto the sore using a cotton swab. Use it three to four times daily.
Some people mix equal parts milk of magnesia and liquid Benadryl for extra pain relief, but check with a pharmacist or doctor first.
When Should You See a Dentist About Canker Sores?
Most canker sores heal on their own within two weeks. However, you should see a dentist or doctor if:
- The canker sore lasts more than three weeks
- The sore is unusually large (bigger than 1cm)
- Pain is so severe you cannot eat or drink
- You develop a high fever
- You get multiple canker sores at the same time
- Canker sores keep coming back every few weeks
- The sore spreads to your lips (could be a cold sore, not a canker sore)
Dentists can prescribe stronger treatments like prescription mouth rinses, steroid ointments, or oral medications to help stubborn canker sores heal faster.
If you are in Windsor and need urgent care, an emergency dentist Windsor can check severe mouth sores the same day.
How to Prevent Canker Sores From Coming Back
Once you know how to get rid of canker sores, the next step is stopping them before they start. Try these prevention tips:
- Switch to a soft-bristle toothbrush and brush gently
- Avoid toothpaste with SLS (sodium lauryl sulfate), which can trigger canker sores
- Manage stress through exercise, sleep, or relaxation techniques
- Keep a food diary to identify your personal trigger foods
- Get enough vitamins, especially B12, folate, and iron
- Fix sharp teeth or rough dental work that keeps cutting your cheek
If anxiety about dental visits prevents you from getting sharp teeth fixed, a sedation dentist can make the experience stress-free.
Finding the Right Dentist in Windsor for Ongoing Oral Health
Frequent canker sores sometimes point to bigger oral health issues. A skilled dentist like Dr. Nidhi Nangia can check for rough fillings, sharp tooth edges, or bite problems that keep causing mouth injuries.
Regular dental care also catches problems before they turn into painful emergencies. If cost is a concern, look for a dentist that accepts CDCP or ODSP benefits.
Many Windsor clinics also offer direct billing, so you do not have to pay upfront and wait for insurance reimbursement.
The Bottom Line: Small Sores, Big Relief
Canker sores are painful, but they do not have to ruin your week. Using even a few of these 10 methods can cut healing time in half and make the pain much more bearable.
Try combining treatments for the best results. For example, rinse with salt water in the morning, apply honey in the afternoon, and use a numbing gel before meals.
If canker sores keep coming back or never seem to fully heal, see a dentist. Persistent sores can sometimes signal vitamin deficiencies, autoimmune conditions, or other health issues that need attention.
You do not have to suffer in silence. Relief is possible, and your smile is worth taking care of.
