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Alcohol Tests

How Long Does Mouthwash Alcohol Stay In Your System?

By A to Z Alcohol Editorial TeamPublished Mar 16, 2024Updated Nov 4, 20261 min read
Quick answer

We found no official study giving a time for mouthwash alcohol in the body. What official rules show is that alcohol left in the mouth can inflate a breath test. U.S. Department of Transportation rules require a waiting period of at least 15 minutes before a confirmation breath test for that reason.

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In this article
  1. What we could confirm
  2. What we could not confirm
  3. Practical points

What we could confirm

In the federal rule for workplace alcohol testing (49 CFR 40.251), the technician must ensure the waiting period lasts at least 15 minutes, starting when the screening test is complete. The rule gives the purpose: to prevent an accumulation of mouth alcohol from leading to an artificially high reading.

What we could not confirm

We found no government or medical source that states how long alcohol from mouthwash stays in your system, or how much alcohol a given mouthwash adds to blood. We do not give a number.

Practical points

  • Check the label. Some mouthwashes list alcohol and some are alcohol-free.
  • Do not use mouthwash to try to pass a breath test. The rule’s wait and second test exist to catch exactly that.
  • Do not drive after drinking. See the standard drink calculator for how drinks are counted.

If you have a question about a medical or legal test, ask a doctor or lawyer.

People also ask

Can mouthwash cause a positive breath test?

Mouth alcohol can raise a reading. Federal testing rules require a wait of at least 15 minutes to prevent artificially high readings.

How long should I wait after using mouthwash before a breath test?

The federal rule requires at least 15 minutes between screening and confirmation tests. We found no official guidance for individuals.

Is there an official figure for mouthwash alcohol in blood?

We found none, so we do not state one.

General information only, not medical or legal advice. If you have a health condition, take medicines or are pregnant, ask your doctor before drinking alcohol. Never drink and drive.

Sources

  1. eCFR: 49 CFR 40.251 (alcohol confirmation tests), read 4 Nov 2026
Written by A to Z Alcohol Editorial Team · Published Mar 16, 2024 · Updated Nov 4, 2026
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