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I have chewed Greco Gum for about two years now. It replaced the regular chewing gum I used to have in my pocket, and I haven't gone back. Greco Gum is pure mastic resin from the Greek island of Chios: one ingredient, no gum base, no sweeteners. Short version: it's the best mastic gum I have tried, and a cleaner swap for plastic-based gum.
My rating: 5/5 ★★★★★
Key takeaways
- I have used Greco Gum for about two years, mostly the Nuggets.
- It's one ingredient: mastic resin from Chios. No gum base, no sugar, no sweeteners.
- Research supports mastic for oral bacteria, bad breath and some stomach issues. It doesn't support the jawline hype.
- A 45 g tin lasts about six weeks and costs from $31.48 (Droplets) or $34.48 (Nuggets).
- Use the code KRISTIAN for free US shipping on your first order (or discounted international shipping).
What is Greco Gum?
Greco Gum sells raw mastic gum: the hardened resin of the mastic tree (Pistacia lentiscus), which grows commercially almost only on Chios. Mastic from Chios has Protected Designation of Origin status in the EU.
Greco buys its mastic through the Chios Mastiha Growers' Association. The resin is harvested in July and August, hand-sorted on Chios, and sorted again at Greco's US warehouse before it ships. It comes in metal tins, not plastic bags. Greco says its mastic is TrueStar certified for contaminants and links its lab analysis on the site.
On its own site, Greco shows 4.79 stars from more than 1,200 reviews and says it has over 52,000 customers.
Why I switched from regular gum
I used to chew regular gum all day without thinking about what was in it. Most chewing gum is built on a gum base made from synthetic polymers, the same family of materials used in plastics and rubber.
A 2025 pilot study from UCLA found that chewing gum released about 100 microplastic particles per gram on average, and up to 600 per gram for some pieces. Mastic wasn't part of that study, so I won't claim it's microplastic-free. But there is no plastic in the recipe: the only ingredient is tree resin. That was enough for me to make the swap.
I wrote about my first months with mastic gum in my mastic gum review. This review is about Greco Gum specifically, after two years of using it.
What two years of chewing Greco Gum is like
The taste
Mastic tastes earthy, a bit piney and slightly bitter at first. It's an acquired taste. After a few minutes the flavor fades into something neutral, and there's no sugar rush or fake mint. I got used to it within the first week, and now regular gum tastes artificial to me.
The chew
Raw mastic starts hard and crumbly, then softens into a proper chew after a minute or two. It holds together for a long time. My jaw muscles felt sore in the beginning, which went away after a couple of weeks.
Consistency
I tried a few other mastic brands before settling on Greco. Some crumbled right away or had bits of debris in them. With Greco, every tin has been the same: clean pieces, no pieces that are too soft or rock hard. After two years that consistency is the main reason I keep ordering.
Everyday use
It's discreet. I chew it at my desk, in meetings and on walks. I've had no stomach issues from it, which I have had with some supplements.
Nuggets vs Droplets: which one to buy
Greco sells two formats of raw gum:
- Nuggets are bigger pieces that soften into a longer, more comfortable chew. They're my everyday pick, and two pieces are enough.
- Droplets are smaller and firmer. They give your jaw more work, and you need more pieces. They can get sticky in cool weather.
If you're new to mastic, or you have fillings or crowns, start with Nuggets. Not sure? The Starter Pack has both.
Is Greco Gum healthy? What the research says
Mastic has been chewed for stomach and breath problems for centuries, and some of that holds up in research:
- Oral health and bad breath: mastic reduces the bacteria behind bad breath, and a 2025 clinical trial found a mastic toothpaste improved halitosis and gum health.
- H. pylori: lab studies show mastic can kill H. pylori, the bacterium linked to stomach ulcers. Human results are more mixed.
- Digestive comfort: in a placebo-controlled trial in people with functional dyspepsia, 77% on mastic reported improvement, versus 40% on placebo.
- No sugar: unlike most gum, it has no sugar or sweeteners at all.
Two caveats. The studies used fairly high, regular doses, so a piece of gum now and then isn't the same thing. And there is no research showing that chewing mastic reshapes your jawline. My jaw feels stronger after two years, but I'd never buy it for the TikTok jawline promise.
I go through the evidence in more detail in mastic gum benefits and mastic gum side effects.
Greco Gum pricing in 2026
Prices from Greco's site, checked in November 2026:
- Starter Pack (Nuggets and Droplets, 30 g, about a month): $41.22, down from $54.96.
- Klassiko tin, 45 g (about six weeks): Nuggets from $34.48, Droplets from $31.48.
- Mikro tin, 15 g (about two weeks): Nuggets from $26.08, Droplets from $22.48.
- Mastic powder capsules (60): from $27.73.
Buy four tins and you get 10% off. US standard shipping is free on orders over $100, and Greco accepts HSA/FSA on eligible orders.
Greco Gum discount code
Pros and cons
Pros
- One ingredient: pure Chios mastic, no gum base or sweeteners.
- Consistent quality from tin to tin, in my experience.
- Clear sourcing through the Chios Mastiha Growers' Association.
- Ships in metal tins, not plastic.
- Research backs its effect on oral bacteria and some digestive issues.
Cons
- The taste takes a week or so to get used to.
- More expensive than regular gum, and pricier per gram than some mastic brands.
- Hard at first, so it can be rough on dental work like fillings, crowns or braces.
Who should try Greco Gum?
Anyone who chews gum daily and wants to drop the synthetic gum base. It's also a good fit if you're curious about mastic for fresh breath or digestion and want a brand that shows where its resin comes from.
Skip it or go easy if you have a lot of dental work, since Greco itself warns that raw mastic is hard. Mastic also comes from the same plant family as pistachios and cashews, which matters if you react to those.
Greco Gum alternatives
Other mastic brands include Titans Jaw, Mastic Chios Gum, Elma and Mast Chew. I compared Greco with the most hyped one in Greco Gum vs Titans Jaw, and I cover where to get it in where to buy mastic gum.
Verdict: 5 out of 5
Greco Gum gets 5 out of 5 from me. Two years in, it's still in my pocket every day. It's a cleaner swap for plastic-based gum, the quality has been consistent, and the sourcing is easy to check. If you want to try it, start with a tin of Nuggets or the Starter Pack, and use KRISTIAN for free US shipping.
Greco Gum
100% pure Chios mastic resin, third-party tested, sourced through the Mastiha Growers' Association.
Greco Gum FAQ
Is Greco Gum legit?
Yes. It's real Chios mastic, bought through the Chios Mastiha Growers' Association, and Greco publishes a lab analysis on its site. I have ordered from them for about two years.
Where does Greco Gum come from?
The mastic is harvested on Chios, Greece, and Greco ships from a US warehouse.
How long does a tin last?
Greco lists the 45 g Klassiko tin as about a six-week supply and the 15 g Mikro tin as about two weeks.
Is there a Greco Gum discount code?
Yes. The code KRISTIAN gives you free US shipping on your first order, or discounted international shipping.
Does Greco Gum give you a better jawline?
There's no research showing that chewing gum reshapes your face. Chewing does work your jaw muscles, but buy it for the sugar-free chew and the oral health benefits, not for a new jawline.
Related reading
- Mastic Gum Review - My honest experience
- Greco Gum vs Titans Jaw
- Mastic Gum Benefits: What's Actually Backed by Science
Sources
- ScienceDaily - "Chewing gum can shed microplastics into saliva, pilot study finds"
- PubMed - "The effect of Chios mastic toothpaste on halitosis and oral hygiene in orthodontic patients"
- PubMed - Huwez et al, "Mastic gum kills Helicobacter pylori"
- ScienceDirect - "Is Chios mastic gum effective in the treatment of functional dyspepsia?"
- Science News - "No, mastic gum won't reshape your jaw"
