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Why does mouthwash burn

Have you ever used mouthwash and felt a burning sensation that made you question whether it was doing more harm than good?  You're not alone. Many people experience this uncomfortable...

Have you ever used mouthwash and felt a burning sensation that made you question whether it was doing more harm than good? 

You're not alone. Many people experience this uncomfortable sensation and wonder why it happens. 

In this blog post, we will dive deep into the world of mouthwash, exploring its ingredients, the role of alcohol, and other possible causes of that burning sensation. 

We will also provide practical tips on how to reduce mouthwash burn and when it might be necessary to seek professional advice from a dentist.

What is Mouthwash?

Mouthwash, also known as oral rinse or mouth rinse, is a liquid solution used to enhance oral hygiene. 

It is typically used after brushing and flossing to provide additional cleaning, freshen breath, and promote overall oral health. While mouthwash comes in various formulations, they often contain a combination of water, flavoring agents, surfactants, antimicrobial agents, and other active ingredients.

Surfactants, such as sodium lauryl sulfate, help to dislodge plaque and debris from the teeth and gums. Antimicrobial agents, like chlorhexidine or cetylpyridinium chloride, work to kill bacteria and reduce the risk of gum disease. These components contribute to the effectiveness of mouthwash in maintaining oral health.

However, one ingredient that often raises concerns and can contribute to that unpleasant burning sensation is alcohol.

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Ingredients in Mouthwash

Mouthwash formulations can vary significantly, but let's focus on the common ingredients found in many commercial mouthwashes:

1. Water:

Water serves as the base for most mouthwashes, providing a liquid medium for other ingredients and diluting the solution.

2. Flavoring Agents:

To enhance the taste and make mouthwash more palatable, manufacturers add flavoring agents like mint, cinnamon, or citrus.

3. Surfactants:

Surfactants, such as sodium lauryl sulfate, help to disperse the solution and ensure even coverage throughout the mouth. 

They assist in removing debris and plaque from the teeth and gums.

4. Antimicrobial Agents:

Antimicrobial agents, like chlorhexidine or cetylpyridinium chloride, are added to mouthwash to kill bacteria and reduce the risk of gum disease. 

These agents play a vital role in maintaining oral hygiene.

5. Alcohol:

Alcohol, often ethanol or denatured alcohol, is a common ingredient in mouthwash formulations. 

It serves multiple purposes, including acting as a solvent, preserving the product, and providing an astringent or antiseptic effect. 

However, it is the presence of alcohol that can cause that uncomfortable burning sensation.

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Alcohol in Mouthwash

The use of alcohol in mouthwash has been a topic of debate among dental professionals and consumers alike. 

While alcohol-based mouthwashes have been shown to effectively kill bacteria and reduce plaque, they also come with potential drawbacks.

The alcohol content in mouthwash is typically between 18% and 26%. This concentration can cause a burning sensation due to its drying effect on oral tissues. When you rinse your mouth with an alcohol-based mouthwash, the alcohol quickly evaporates, leaving behind a dry sensation that can be uncomfortable for some individuals.

Moreover, alcohol can also irritate any existing mouth sores or wounds, amplifying the burning sensation. If you have sensitive gums or any oral lesions, the alcohol in mouthwash can exacerbate the discomfort and make it feel like your mouth is on fire.

How Alcohol Causes a Burning Sensation

Alcohol's ability to cause a burning sensation in the mouth is rooted in its unique properties. 

When alcohol comes into contact with oral tissues, it acts as a desiccant, drawing moisture out of the cells. This drying effect can lead to tissue irritation and a burning sensation.

Additionally, alcohol can disrupt the natural balance of the mouth's microbiome. The oral cavity is home to various microorganisms, including both beneficial and harmful bacteria. Alcohol's antimicrobial properties can kill these bacteria, but it can also disturb the delicate equilibrium, potentially causing imbalances and further irritation.

It's important to note that not everyone experiences mouthwash burn. Some individuals may be more sensitive to the effects of alcohol, while others may have a higher tolerance. 

Factors such as overall oral health, individual sensitivity, and previous exposure to alcohol-based products can influence the severity of the burning sensation.

After using your KIWIBIRD pink electric toothbrush for the time recommended on the product label, simply rinse your mouth with mouthwash to maximise its effectiveness.

Other Possible Causes of Mouthwash Burn

While alcohol is a common culprit behind mouthwash burn, it's not the only potential cause. 

Other factors that can contribute to a burning sensation include:

1. High Concentrations of Flavoring Agents:

In some cases, mouthwashes with high concentrations of flavoring agents can cause a burning sensation. These agents may irritate the oral tissues, especially if you have a sensitivity or allergy to certain flavors.

2. Acidic pH:

Mouthwashes with a low pH, meaning they are acidic, can also lead to a burning sensation. Acidic solutions can irritate the mucous membranes, causing discomfort and a burning feeling.

3. Sensitivity or Allergy:

Individuals with pre-existing sensitivities or allergies to certain ingredients in mouthwash may be more prone to experiencing mouthwash burn. 

It's essential to read the product labels carefully and choose a mouthwash that suits your specific needs.

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How to Reduce Mouthwash Burn

If you experience mouthwash burn and want to continue using mouthwash as part of your oral hygiene routine, there are several strategies you can try to reduce the discomfort:

1. Choose an Alcohol-Free Mouthwash:

Opting for an alcohol-free mouthwash can eliminate the drying effect and reduce the likelihood of experiencing a burning sensation. Look for mouthwashes labeled as alcohol-free or those that use alternative antimicrobial agents.

2. Dilute the Mouthwash:

If you prefer to stick with an alcohol-based mouthwash, you can try diluting it with water. This can reduce the concentration of alcohol and minimize the burning sensation while still providing the desired benefits.

3. Rinse for a Shorter Duration:

Instead of vigorously swishing mouthwash around your mouth for an extended period, try reducing the rinsing time. This can limit the exposure of your oral tissues to the alcohol and potentially alleviate the burning sensation.

4. Use Mouthwash After Brushing:

Using mouthwash after brushing your teeth can help remove any residual toothpaste or debris, reducing the chances of irritation. Brushing beforehand also allows your toothpaste's fluoride to remain on your teeth, maximizing its benefits.

Take charge of your oral hygiene today and make KIWIBIRD rechargeable water flosser and mouthwash an essential part of your daily routine.

When to See a Dentist

While mild mouthwash burn is usually temporary and harmless, there are situations where it's best to consult a dentist:

1. Severe or Prolonged Discomfort:

If the burning sensation persists for an extended period or becomes increasingly severe, it's advisable to seek professional advice. Your dentist can evaluate the cause and provide appropriate guidance.

2. Oral Lesions or Sores:

If you have existing oral lesions or sores that are aggravated by mouthwash, it's essential to have them examined by a dentist. They can assess the condition and recommend appropriate treatment.

3. Allergic Reactions:

If you experience any signs of an allergic reaction, such as swelling, rash, or difficulty breathing after using mouthwash, seek immediate medical attention. Allergic reactions can be severe and require prompt treatment.

By using the KIWIBIRD portable oral irrigator, you can improve your oral health and enjoy a refreshing feeling in your mouth. 


Mouthwash burn can be an uncomfortable experience, but understanding its causes and knowing how to reduce the discomfort can make a significant difference. 

While alcohol is a common culprit behind mouthwash burn, other factors like high concentrations of flavoring agents, acidic pH, and individual sensitivities can also contribute to the sensation. 

By choosing an appropriate mouthwash, diluting the solution, or adjusting your rinsing technique, you can minimize the burning sensation and continue to enjoy the benefits of mouthwash in your oral hygiene routine. 

Remember, if the discomfort persists or worsens, it's always best to consult your dentist for professional guidance.

Use KIWIBIRD electric toothbrush, specially designed for sensitive individuals. Experience a gentle yet effective cleaning with its soft bristles and advanced vibration technology.

Pair it with the KIWIBIRD water flosser, featuring a germicidal function that eliminates harmful bacteria, ensuring a thorough clean every time.


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