How Much Alcohol Is In Listerine And Is It Safe?

Listerine is one of the most recognizable mouthwashes in the world, and for decades its sharp, burning taste came from a high concentration of alcohol. That bite is memorable enough that people have asked whether swallowing it could get them drunk, whether it can affect a breathalyzer test, and whether it is safe to use at all. Here is the direct answer: many Listerine products historically contained alcohol in the range of about 21% to 27% by volume, though the exact amount depends on the specific product and the version sold in your country. Listerine today also makes alcohol-free versions, and the alcohol content of any bottle is printed on the label. The product is safe when used as directed — swished and spit out. It is not safe to swallow.

How Much Alcohol Is In Listerine And Is It Safe?

Original Listerine and several of its classic variants have traditionally been formulated with ethanol at roughly 21% to 27% by volume. For comparison, that is stronger than most wine and close to some spirits, though you are using a small amount and spitting it out.

The exact figure is not universal. Different Listerine products — Cool Mint, FreshBurst, Original, and others — have carried different alcohol levels over the years, and formulations have changed. The most reliable number is the one printed on the back of the bottle you own. Listerine also sells explicitly alcohol-free versions, which list no ethanol at all.

Is it safe? Used as intended, yes. The intended use is to measure a small amount, swish for the time stated on the label, and spit it into the sink. Swallowing mouthwash is a different situation entirely and is discussed below.

Why Does Listerine Contain Alcohol At All?

Alcohol in mouthwash serves a few practical purposes. It acts as a solvent, helping the flavor oils and other ingredients dissolve into a stable liquid. It contributes to the sharp, cooling sensation many longtime users associate with the product. And ethanol has some antibacterial activity on its own.

Here is a point worth clarifying, because it is widely misunderstood: the alcohol is not the main thing killing bacteria in Listerine. The active ingredients in Listerine are essential oils — typically eucalyptol, menthol, methyl salicylate, and thymol. Those oils are the components studied for reducing plaque and gingivitis. The alcohol is largely there to carry them and to create the sensation. This is why alcohol-free versions can still make the same antibacterial claims.

Can You Get Drunk From Listerine?

Swallowing enough Listerine can raise your blood alcohol level, because the ethanol in it is the same type of alcohol found in beer, wine, and liquor. This is not a theoretical concern. Case reports and poison control data have documented alcohol intoxication from mouthwash ingestion, and it has been a recognized problem in settings where access to other alcohol is restricted.

The amount needed to feel effects depends on body weight, how much is swallowed, and how fast. A single accidental sip from swishing is very unlikely to cause intoxication in an adult. Deliberately drinking a bottle is a different matter and can produce dangerous blood alcohol levels.

Children are at much higher risk. Their smaller body size means a relatively small swallowed amount can cause serious symptoms. Mouthwash should be stored out of reach of young children, the same way you would store medication.

Does Listerine Affect a Breathalyzer Test?

It can, briefly. Because mouthwash contains ethanol and sits in your mouth, residual alcohol can register on a breath test taken immediately after use. This is a real effect and has been raised in legal defense contexts.

The key word is briefly. The alcohol in your mouth evaporates and clears within a short time — commonly cited as around 10 to 15 minutes. A breath test taken well after rinsing, with nothing swished right beforehand, is not expected to show a false reading from mouthwash. If you are being tested for any reason, the practical point is simply not to rinse your mouth with anything containing alcohol right before the test.

This is separate from drinking the product. Swallowing Listerine raises actual blood alcohol, which a breathalyzer is designed to measure.

Is Alcohol-Free Listerine Just As Effective?

For most people, alcohol-free versions deliver the same core benefit. The antibacterial and anti-plaque action comes primarily from the essential oils, not the ethanol, so removing the alcohol does not remove the active ingredients.

The main differences are sensory and practical:

• Alcohol-free versions do not produce the same burning sensation, which many people prefer.
• They tend to be gentler on the mouth, which matters if you have dry mouth, mouth sores, or sensitive gums.
• They avoid the alcohol-related concerns around swallowing and breath tests.

One caveat: not every alcohol-free mouthwash contains the same active ingredients. Some rely on different antibacterials entirely. If you are choosing for a specific dental concern, check that the product lists the active ingredients you are looking for.

Does Alcohol In Mouthwash Cause Oral Cancer?

This is one of the most persistent questions, and the honest answer is that the evidence is not clear-cut. Some studies have suggested an association between long-term alcohol-containing mouthwash use and cancers of the mouth or throat, particularly in people who also smoke or drink heavily. Other studies have found no such link.

The evidence is mixed, and observational studies of this kind cannot prove cause and effect. What is well established is that heavy alcohol consumption and tobacco use are major risk factors for oral cancer. Whether the much smaller alcohol exposure from rinsing and spitting adds meaningful risk is genuinely debated among researchers.

Organizations that review dental products have continued to regard alcohol-containing mouthwash as acceptable for general use. If you are concerned, particularly if you have other risk factors, alcohol-free options are widely available and remove the question entirely.

Who Should Avoid Alcohol-Containing Mouthwash?

For some people, choosing alcohol-free is the sensible call regardless of the broader debate.

• Children, who are at higher risk from accidental swallowing.
• People with dry mouth, since alcohol can worsen dryness and irritation.
• Anyone with mouth sores, ulcers, or recent oral surgery, where alcohol can sting and slow comfort.
• People in recovery from alcohol use disorder, for whom avoiding alcohol in any form may be important.
• Anyone who has had a reaction or sensitivity to alcohol-based products.

Pregnant women should follow their clinician’s guidance on oral care products rather than relying on general reasoning. No specific safety threshold for swallowed mouthwash alcohol in pregnancy is established, so the safe approach is simply not to swallow it.

What Happens If You Swallow Listerine By Accident?

A small accidental swallow during rinsing is generally not dangerous for a healthy adult. Rinse your mouth with water and continue your day.

A larger amount — especially in a child — is a medical concern. Symptoms of alcohol poisoning can include vomiting, confusion, drowsiness, slow or irregular breathing, and clammy skin. If you suspect a child or anyone else has swallowed a significant amount of mouthwash, contact Poison Control or emergency services right away. Do not wait for symptoms to appear.

If you or someone else has been drinking mouthwash deliberately and repeatedly, that is a sign of a serious problem, and help is available through medical and support services.

How Should You Use Listerine Safely?

Follow the label. The general pattern for mouthwash is to measure the stated amount, swish for the time indicated, and spit it out. Do not swallow. Do not dilute it unless the label says to.

Mouthwash is a supplement to brushing and flossing, not a replacement. It reaches surfaces that a toothbrush may miss, but it does not remove plaque the way mechanical brushing does. For most people, the biggest oral health gains come from brushing twice a day and cleaning between the teeth.

Store mouthwash out of reach of children and pets. Keep it away from anyone who might mistake it for a beverage, and never transfer it into an unlabeled container.