Mouthwash is a common part of daily oral care routines, helping to control plaque buildup, prevent tooth decay, and fight bad breath.
However, mouthwash products contain ingredients that can be harmful if ingested in large amounts. Accidentally swallowing a small quantity is usually harmless for adults, but intentional or large ingestion can be dangerous. If symptoms like vomiting, dizziness, or diarrhea occur after swallowing mouthwash, it's best to contact poison control.
Why You Should Avoid Swallowing Mouthwash
When used correctly—swishing for about 30 to 60 seconds and then spitting out—mouthwash is safe. Accidentally swallowing a tiny amount once in a while is unlikely to cause harm.
Still, most mouthwash products contain substances such as alcohol and other chemicals that can become toxic if consumed in significant amounts.
Many mouthwashes contain between 5% and 27% ethanol (alcohol), which can cause symptoms similar to alcohol intoxication if a large amount is swallowed.
Other common mouthwash ingredients, including methyl salicylate, hydrogen peroxide, and fluoride, can also cause serious gastrointestinal upset and disrupt the body's acid-base balance when ingested in excess.
For safety reasons, experts recommend that children younger than six avoid using mouthwash, as they are more likely to accidentally swallow it.
Key Ingredients Found in Mouthwash
Different types of mouthwash may contain various active components designed to improve oral health. However, some of these ingredients can be harmful if swallowed in large quantities. Common ones include:
- Chlorhexidine gluconate
- Cetylpyridinium chloride
- Ethanol (ethyl alcohol)
- Fluoride
- Hydrogen peroxide
- Methyl salicylate
- Essential oils like menthol and eucalyptol
Possible Health Effects of Swallowing Mouthwash
The effects of swallowing mouthwash can vary depending on the amount consumed and the ingredients present.
Mild to Moderate Symptoms
Ingesting a moderate amount of mouthwash may lead to:
- Stomach upset
- Nausea and vomiting
- Drowsiness
- Slowed breathing
- Signs of intoxication
Severe Symptoms
Swallowing larger amounts can result in more serious health issues, including:
- Diarrhea
- Dizziness
- Headaches
- Low blood pressure
- Rapid heartbeat
- Slurred speech
- Throat pain
- Loss of consciousness
- Decreased reflexes
- Urination difficulties
- Coma (in rare, extreme cases)
Effects in Children
Children are particularly vulnerable to the effects of swallowing mouthwash, even in small amounts. Due to the alcohol content, risks include:
- Hypoglycemia (low blood sugar)
- Seizures
- In very rare cases, death
If a child ingests any amount of mouthwash, it's important to contact a healthcare provider immediately.
What To Do After Swallowing Mouthwash
If someone swallows a small amount of mouthwash, serious consequences are unlikely. However, it's wise to take precautionary steps:
- Rinse the mouth thoroughly with water.
- Ensure the individual is not choking or having trouble breathing.
- Avoid inducing vomiting unless instructed by a medical professional or poison control.
- Stay calm and monitor for any unusual symptoms.
If a large amount has been swallowed, immediately call the National Poison Control Center at 1-800-222-1222 and seek urgent medical care.
Monitoring and Care at Home
There are no specific home treatments for swallowing mouthwash. Experts recommend close monitoring for any signs of distress.
- Stay awake and alert.
- Avoid driving or operating machinery.
- Have another adult nearby in case symptoms worsen.
- Check the mouthwash label for ingredients (especially alcohol content) and try to estimate how much was consumed — this information can help medical responders.
When To Contact a Doctor or Poison Control
If you or someone else experiences symptoms like dizziness, vomiting, diarrhea, excessive drowsiness, or trouble breathing after swallowing mouthwash, seek medical help immediately.
When calling poison control, it's helpful to provide:
- The individual's age and weight
- Any known medical conditions
- The name and ingredients of the mouthwash
- How much was swallowed
- The time the mouthwash was ingested
Quick Summary
When used properly, mouthwash is safe and beneficial for maintaining oral hygiene. Accidentally swallowing a small amount usually isn't harmful, but ingesting larger quantities can lead to serious health issues due to ingredients like alcohol, fluoride, and other chemicals.
If you or someone else swallows mouthwash and symptoms develop, contact poison control or seek medical assistance promptly.
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