I've been chewing mastic gum almost daily for over a year, and Greco Gum is the brand that got me into it - you can read my full six-month review here if you want the long version. Since then, a newer brand called Titans Jaw has been showing up in my inbox and in TikTok ads, leaning hard on the idea that chewing mastic gum trains your jawline. I wanted to compare the two brands properly: where the mastic actually comes from, what you're paying for, how they chew and taste, and where the marketing gets ahead of the science.
Category | Greco Gum | Titans Jaw |
Sourcing | Chios, Greece - sourced through the Mastiha Growers' Association, third-party tested by harvest | Chios, Greece - marketed as authentic Chios mastiha, less public sourcing documentation |
Ingredients | 100% pure mastic resin, no additives or sweeteners | 100% pure mastic resin, no additives or sweeteners |
Formats | Nuggets (larger, softer chew) and Droplets (smaller, firmer chew) | Small and medium size "tears" |
Price | Roughly $30-46 per 1.59 oz tin | Roughly $20 per 1 oz bag |
Marketing angle | Digestive support and gut health first, jawline mentioned but not the headline pitch | Leans heavily on "jaw training" and "strong jawline" branding |
Third-party testing | Publishes harvest test results | Not publicly published |
Sourcing and Quality Transparency
Both brands claim their mastic comes from Chios, the Greek island that's essentially the only commercial source of Pistacia lentiscus resin in the world. That part isn't in dispute - Chios has a protected designation of origin for mastic, and legitimate mastic almost always traces back there.
Where the two brands differ is in how much they show their work. Greco Gum sources through the Mastiha Growers' Association of Chios and says it publishes third-party test results for each harvest, including species-level verification. That kind of documentation matters in this category, because mastic gum is expensive to produce in small quantities, and cheaper "mastic-flavored" or blended products do exist on the market.
Titans Jaw also markets its product as authentic Chios mastiha and "made in Greece," and reviewers generally describe it as real mastic tears. But I couldn't find the same level of public batch testing or sourcing documentation on their site or listings. That doesn't necessarily mean the product isn't genuine - it just means Greco currently makes it easier to verify what you're getting.
Flavor, Format and Chewing Experience
Neither brand adds sweeteners or artificial flavoring, so you're getting the natural, resinous, slightly piney taste of mastic either way. It's an acquired taste - earthy and a bit bitter at first, fading to something more neutral once you've chewed for a few minutes.
Greco sells two formats: Nuggets, which are larger pieces that soften into a more comfortable, longer chew, and Droplets, which are smaller and firmer. Titans Jaw sells small and medium "tears," which several buyers describe as quite hard and prone to sticking to teeth early on, sometimes taking real effort (or floss) to fully break in.
If you're new to mastic gum, the softening curve matters more than people expect. A gum that's brutally firm straight out of the packet can be discouraging before it ever turns into something chewable.
Price and Value
Titans Jaw is the cheaper option, generally running around $20 for a 1 oz bag. Greco Gum runs higher, typically $30 to $46 for a 1.59 oz tin depending on format and promotions, though it offers multi-tin discounts.
On a per-gram basis, Titans Jaw is the better deal. Whether that's the better value depends on how much sourcing transparency and consistency are worth to you. Reviewers of both brands note that mastic quality can vary piece to piece, especially with lower grades, so paying more for graded, tested product isn't purely about branding.
About the "Jawline Training" Marketing
This is the part where I want to be direct, because it's the main way Titans Jaw differentiates itself. The name itself is built around the idea that chewing mastic gum trains and sharpens your jawline, and a lot of the marketing copy - and TikTok content around both brands - leans into "jaw workout" language.
There is no published research showing that chewing mastic gum, or any gum, reshapes your jawline or face. Science News looked into this claim directly and concluded that mastic gum "won't turn your jaw into granite," even though it does have legitimate value as an antibacterial agent for oral health. A 2024 study found that chewing regular gum three times a day for six months had no measurable effect on jawline appearance, and a separate 2024 study found that gum-chewing training increased bite force without producing any visible change in facial shape.
So the resistance-training logic isn't crazy on its face - chewing a firm substance does work your masseter muscle. But "works the muscle" and "visibly reshapes your jawline in weeks" are two very different claims, and only the marketing makes the second one. I'd treat any jawline promise from either brand as unproven, and I'd be especially skeptical of before-and-after photos, which are easy to stage with lighting, angle, and flexing.
Chewing something genuinely hard for long stretches every day can aggravate the jaw joint in some people. If your jaw starts aching, that's not progress - that's a sign to back off.
My Recommendation
If sourcing transparency, third-party testing, and a more forgiving chewing experience matter to you, Greco Gum is the one I keep coming back to, and it's what I still use myself. If you mainly want an affordable way to try mastic gum for its actual, better-supported uses - oral health and digestive support - Titans Jaw is a reasonable lower-cost option, as long as you go in without expecting a visibly different jawline.
Greco Gum
100% pure Chios mastic resin, third-party tested, sourced through the Mastiha Growers' Association.
Either way, don't buy mastic gum for the jawline claim. Buy it, if you buy it, for the things the research actually backs.
A Quick Note on Other Mastic Gum Brands
Greco Gum and Titans Jaw aren't the only names in this space. Brands like Mastic Chios Gum, Elma Mastic Gum, and Mast Chew all source from the same island and compete mostly on softness, flavor, and price rather than jawline claims. If neither Greco nor Titans Jaw fits your budget or taste preference, it's worth knowing the category is bigger than these two - but the same rule applies across all of them: verify the Chios sourcing, and don't buy based on facial transformation promises.
How I Weighed the Comparison
To be transparent about my own bias: I used Greco Gum first, for months, before Titans Jaw existed as a brand I was aware of. That means my day-to-day experience with Greco is deeper than my experience with Titans Jaw, which I've evaluated mainly through its published sourcing claims, ingredient lists, pricing, and publicly available customer reviews rather than months of personal use. I've tried to flag that distinction throughout rather than pretend the comparison is perfectly even.
What I can say with more confidence, because it doesn't depend on personal taste, is the sourcing and documentation gap. That's the one area where Greco has a clear, verifiable edge, regardless of which brand's flavor or chew you personally prefer.
