Alum Canker Sore Swelling: A Complete Guide

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What is Alum and How Does it Help Canker Sores?

If you’ve ever suffered from canker sores, you know how painful they can be. Alum is a common home remedy for canker sores that has been used for decades. Alum is a type of salt that has astringent properties, which means it can help tighten and dry out tissues, reducing swelling and pain in the process.

How to Use Alum for Canker Sores

To use alum for canker sores, you’ll need to create a solution. Start by mixing a pinch of alum powder with a few drops of water to create a paste. Then, apply the paste directly to the canker sore using a cotton swab. You can also dissolve a small amount of alum powder in warm water and use it as a mouthwash.

Tips for Using Alum Safely

While alum is generally safe to use, there are a few precautions you should take. For example, you should avoid swallowing the alum solution, as it can be toxic in large doses. Additionally, if you experience any adverse reactions, such as itching or swelling, stop using alum and consult with your doctor.

Other Home Remedies for Canker Sores

In addition to alum, there are several other home remedies you can try for canker sores. For example, rinsing your mouth with salt water or baking soda can help reduce inflammation and promote healing. You can also try applying a mixture of honey and turmeric directly to the sore.

When to See a Doctor

While canker sores are generally harmless and will go away on their own, there are times when you should see a doctor. For example, if your canker sore is unusually large, lasts for more than two weeks, or is accompanied by a fever, you should seek medical attention.


Alum is a popular home remedy for canker sores that has been used for generations. While it can be an effective way to reduce swelling and pain, it’s important to use it safely and in moderation. If you’re unsure about whether alum is right for you, consult with your doctor or dentist.