Tea Tree Oil Mouthwash: Why We Skip the Recipe

Search for tea tree oil and mouthwash and you will find recipes by the dozen. We will be direct about where we stand: we keep tea tree oil out of the mouth, and we sell ours for external, cosmetic use only. The reasons are worth laying out, because they are good ones.

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What poison experts say

The National Capital Poison Center, which runs Poison Control in the United States, describes tea tree oil as poisonous if swallowed and says it should not be taken by mouth for any reason. It acknowledges that people have used the oil as a mouthwash and for bad breath, toothache and mouth ulcers, and still gives that answer. Its examples are sobering: a child who swallowed a small amount and went into a coma, a 23-month-old who swallowed up to 10 ml and became confused and unable to walk before recovering within hours, and an adult who swallowed a teaspoonful and had dizziness, vomiting and slurred speech. The page gives no safe dose, so we do not offer one. If someone may have swallowed the oil, it advises calling Poison Control at 1-800-222-1222.

The standard tea tree review reaches the same place from the toxicology side. It reports that the oil can be toxic if swallowed, based on animal studies and human poisoning reports, and a mouthwash is exactly the product where a swallow is most likely.

Plenty of readers arrive here wondering whether we simply have not heard of the research. We have, and it is worth looking at honestly, because a good answer is better than a quick no.

What about the mouthwash studies?

It is fair to ask, because studies exist. A systematic review of 46 randomized trials of tea tree oil lists dental research as the biggest group, with 18 trials, and notes that rinses containing 0.2% to 0.5% tea tree oil appear to help with plaque. The same review rates the overall research quality as poor to moderate and says larger, better-reported trials are needed. The standard review describes mixed results too: a 0.2% rinse used once a day for a week reduced oral bacteria compared with placebo, while a roughly 0.34% rinse did not differ from placebo on plaque measures.

Look at the numbers, though. Those are finished rinses made by researchers at about a fifth of one percent, in studies. Our oils are sold undiluted. A kitchen bottle of mouthwash would start from a concentrated oil that does not dissolve in water; the standard review notes that its lipophilic nature causes miscibility problems in water-based products. That means drops can float in a cup as a concentrated film. Reasoning from those facts, we do not think a home mix can reproduce a studied rinse, and we do not make any claim that our oils help with the mouth, teeth or gums.

We mention all this because we know how persuasive a confident recipe can be. A recipe written in a cheerful tone looks as though someone has checked it, when often it has simply been repeated from page to page. When the subject is something that goes in the mouth, we would rather be the voice that says no than add one more recipe to the pile.

It is also worth saying that wanting a fresh feeling in the morning is completely reasonable. The question is only which bottle on which shelf is built for the job.

Better ways to enjoy a fresh feeling

Dental care questions are best taken to a dentist, who can tell you what suits your mouth. For a fresh-smelling bathroom or a clean aroma around the house, tea tree oil does have a lovely role. Our oils have a crisp, green, camphorous scent, which fits a diffuser blend or a scented dish on a shelf much better than a mouthwash cup. For ideas, see everyday uses at home and what tea tree oil smells like.

What to reach for instead

If it is a fresh-feeling rinse you are after, the pharmacy shelf has plenty of options made for the purpose, and a dentist can tell you which kind suits your mouth. Read the label and follow the directions, and ask a pharmacist if anything is unclear.

When you open our bottle you will notice how strong the aroma is, even at arm's length. That sharpness is a good reminder of why a concentrated oil does not belong near the mouth, and why it is happiest in a scent dish or a diffuser blend instead.

If you keep tea tree oil at home

Store it as the Poison Control page advises for medicines: in its original container, out of sight and out of reach of children.
Keep it away from pets as well.
Our dilution guidance for skin is 0.5% to 2% in a carrier oil after a patch test; the bottle is not for internal use.
Read the swallowing guide if anyone in the house is curious about the taste of things.

If you want a mouthwash, a pharmacy shelf is the place to look. If you want the scent of tea tree oil, we are always glad to talk about it, and you can reach us in writing through our contact page with any question about the oils we sell.