Wow. Addicted to this product. First introduced at a Ritz, totally appropriate for the kind of product this is. Love it - five star.
OLAS
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Meet our new 500 mL OLAS Marine Bio-Active Mouthrinse — the largest, most practical format we’ve ever released.
While our 100 mL, 200 mL, and 375 mL bottles are all premium glass, this mouthrinse size will come in lightweight plastic bottles. Why?
Because sustainability means more than just materials.
By switching to plastic for this larger size, we can:
Yes — it's plastic. But it's a conscious decision to support eco-conscious shipping, less frequent deliveries, and a smaller carbon footprint overall.
Please note: Due to our commitment to small batch production, slight variations in taste and packaging may occur. The product you receive may have minor differences from the images displayed on this page.
Aqua (purified water), glycerin, xylitol, sodium bicarbonate, rosmarinus officinalis (rosemary) leaf extract, anthemis nobilis flower oil, commiphora myrrha oil, citrus paridisi (grapefruit) peel oil, thymus vulgaris extract, citrus aurantium dulcis (orange) extract, echinacea angustifolia extract, boswellia serrata gum extract, cupressus sempervirens (cypress) leaf extract, glycyrrhiza glabra (licorice) extract, cyanobacter (blue green algae) extract & marine seaweed collagen, saccharomyces/sodium ferment & saccharomyces/calcium ferment & saccaromyces magnesium/ferment & adenosine trifosphate, sodium bicarbonate, polyglyceryl-4 laurate/sebacate (and) polyglyceryl-4 caprylate/caprate (and) water, melaleuca alternifolia (tea tree) leaf oil, citrus medica limonum (lemon) peel oil, l-menthol 100%, ubiquinone
Does not contain any alcohol, sodium lauryl sulfate, fluoride, artificial colors or fragrances.
“A lot of mouth rinses use chemicals otherwise seen in bathroom disinfectants, but this one is formulated with 100 percent natural marine enzymes and is every bit as effective.” - Lindsay Ellingson
“I‘m obsessed... so powerful and yet so natural.” - Andreja Pejić
If you are not satisfied with your purchase, please contact us within 30 days for a full refund.

Overall rating: 4.9 / 5 from 164 reviews.
Wow. Addicted to this product. First introduced at a Ritz, totally appropriate for the kind of product this is. Love it - five star.
Jeremy C. 5/5 Verified
I really like Olas mouthwash. It has a refreshing taste and feels high quality. It leaves your mouth feeling clean and fresh without being too harsh. Definitely a great product!
Edward H. 5/5 Verified
Best mouthwash on the planet
Massimo T. 5/5 Verified
We have been searching for an effective and fresh-tasting mouthwash for years. When we picked up a small bottle at our dentist’s office, we knew we have finally found the one! OLAS mouth rinse is, without a doubt, the best tasting and effective choice! Now we purchase them in 500ml bottles via OLAS’s subscription service. Try it and we promise that you will not be disappointed.
Maury B. 5/5 Verified
It’s a great product
Stephen H. 5/5 Verified
We absolutely love our Olas mouthwash. We keep it well stocked to make sure we don’t run out of it.
Fran X. 5/5 Verified
It's like a spa for your mouth!
James O. 5/5 Verified
We first experienced Olas mouth rinse at the Fairmont le Reine Elizabeth in Montréal, where it was provided in our room. Marvelous stuff! We now conveniently purchase directly online.
David S. 5/5 Verified
Best mouth wash I have ever used. Has helped get rid of all sorts of problems.
Katherine A. 5/5 Verified
LOVE it!
Sara G. 5/5 Verified
Love this product!
Billy C. 5/5 Verified
We love this mouthwash, it leaves you mouth feeling clean and healthy. No harsh burn and mouth dryness like other mouthwashes leave your mouth feeling.
Melissa N. 5/5 Verified
Discovered this mouthwash during a hotel stay on vacation and loved it instantly. The flavor is smooth, not harsh, and it leaves your mouth feeling super fresh. We liked it so much that it’s now the only mouthwash we use at home!
Zuzana Z. 5/5 Verified
Love all these products. They make my teeth and mouth feel great. What a fresh taste and feeling. The brush is soft bristle perfect to not irritate my gums.
Cosmo F. 5/5 Verified
If you told me there was a better mouthwash out there I would not believe you. I rarely like the samples from hotel rooms but this was such an amazing find. Trust me you won’t be disappointed and a little goes a long way. Bought the three pack cuz I’m obsessed!!!
Dechana R. 5/5 Verified
I love it so much I wish they made a bigger bottle.
Liam C. 5/5 Verified
I was looking for an alternative to the big corp mouthwashes and I found this. I love it and I will continue using it in the future!
Ryan D. 5/5 Verified
Great product!
Ashley T. 5/5 Verified
Great stuff!!!!
Reynolds H. 5/5 Verified
This is a fantastic product! Leaves my mouth clean and fresh for a long time. Highly recommend this to everyone.
Jeff H. 5/5 Verified
Best mouthwash period. Leaves you feeling extra confident!
Michael G. 5/5 Verified
Absolutely love this product! Not only a clean product but is very refreshing. Results last and make your mouth and breath really clean and fresh.
Jeff H. 5/5 Verified
Whole new level of mouth freshness
Yasmin H. 5/5 Verified
We first tried your mouthwash while on vacation in Palm Springs at the Ritz-Carlton, and it was love at first taste! When we got home, I ordered immediately.
Dennis L. 5/5 Verified
Amazing product! Best and most refreshing sensation! Highly recommended!
Rafael C. 5/5 Verified
Good big size bottle for refilling my tinier bottles! I don’t mind that it’s plastic since my small bottles are glass which feels more luxurious.
Kaitlin B. 5/5 Verified
Best mouthwash out there
Greg L. 5/5 Verified
My wife & I were in Prague, and the hotel provided tiny bottles of Olas mouthwash. I had not heard of Olas before - we've always been Listerine users. I tried it, and my mouth felt and tasted much cleaner and more refreshed than ever before. I immediately went online and ordered the 500 ml bottles. It's more expensive than the other brands, but it's more than worth it - and you don't need to use that much for a complete overhaul of your oral hygiene. Unlike advertisements that say "it really works," I am a new customer - and it REALLY works.
David S. 5/5 Verified
I love this stuff so much I buy it in bulk— now that my husband has also discovered the awesomeness within the cool bottle on our bathroom sink counter, we’re going through it quickly…
Bethany H. 5/5 Verified
so good so fresh
Martin M. 5/5 Verified
Amazing mouthwash. First had it at the Ritz Carlton Naples, was pleasantly surprised to then have it at Ritz Boston and others as well Since Covid, it’s the only thing that clears my sinuses (with all of the healthy benefits for the teeth) as well Win win
Judith C. 5/5 Verified
I first experienced this at several Marriott hotels - Ritz and Luxury Collections. It was refreshing yet not abrasive like Listerine. I also felt better seeing natural ingredients, including Xylitol. Best mouth feel ever and amazing complimented with its toothpaste. Worth the $$$.
Ada C. 5/5 Verified
I discovered Olas mouthwash at my hotel in London. I dislike the mouthwashes with all the chemical ingredients so Olas is perfect for me! I love its taste and the fresh feeling I get even after I use it!! My husband loves it too!!!
Leslie C. 5/5 Verified
Great product, refreshing taste, with no burning, unlike like many other mouthwashes!
John B. 5/5 Verified
Best mouthwash out. No competition.
Michael G. 5/5 Verified
Still love the mouthwash but it tastes a bit different when in the plastic bottle
Michael S. 5/5 Verified
Love, love, love this mouth rinse! It feels clean and healthy and wonderfully delightful every time I use it! You have a constant customer in me!
Jourdan S. 5/5 Verified
Have been using this for a while. Giving u confidence whenever opening mouth.
Wei W. 5/5 Verified
Likes the way it makes my mouth feels.
Homa T. 5/5 Verified
The mouthwash is like non-other. I will definitely re-order.
Andrew M. 5/5 Verified