How long does mastic gum last?

Mastic gum is a completely natural product with no artificial flavors, colors, sweeteners, or preservatives. It doesn’t need them: like honey, there’s nothing in mastic gum that spoils.

Kept in a sealed tin in a cool place, mastic gum lasts for months or even years. For the best flavor and texture, though, we recommend using it before the date listed on the tin.

How long can you chew mastic gum?

Mastic gum, also known as Chios mastiha, is a plant resin that’s harvested only on the Mediterranean island of Chios in Greece.

This traditional Greek gum comes exclusively from the Pistacia lentiscus species (the mastic tree). Unlike commercial gums, which come in minty or fruity flavors, mastic gum is naturally flavored and free of additives.

One thing that sets mastic gum apart is how long you can chew it. A single piece holds up for hours, and you can re-chew it across several sessions, commonly around three. Store the chewed piece in a glass of water between sessions so it doesn’t dry out.

Chewing for 10 to 15 minutes is enough to release the resin’s bioactive compounds and cover the oral and gut benefits. Mastic gum contains antioxidant, antimicrobial, and anti-inflammatory compounds that help fight ulcers, Helicobacter pylori infections, heartburn, and high cholesterol, with few reported side effects.¹²³ Early research points to Crohn’s disease as well.¹

Jaw training calls for longer sessions, working up toward 30 to 60 minutes as your jaw adapts. All told, a piece is good for roughly four to six hours of chewing before it breaks down into a grainy texture, which is the sign to start a fresh one.

Chew it for at least 15 minutes, save the piece for later, or keep going until it gives out.

How long will mastic gum stay fresh?

Mastic gum has a recommended shelf life of two to three years, depending on how it’s been handled and stored.

Its appearance starts to change about a year after harvest. The cause is oxidation: exposure to air and light. Oxygen reacts with the compounds in mastic gum and slowly changes its color, texture, and flavor.

Oxidized mastic gum darkens toward yellow-gold and dries out, turning harder and more brittle. Its fresh, pine-like aroma and taste fade too.

To spot oxidized gum, look for a darker golden color, a faded smell and taste, and a piece that feels drier and harder than usual.

There’s no research on whether aged mastic keeps its full potency, but its documented benefits for oral health, inflammation, and stomach complaints like H. pylori ulcers¹³⁴ most likely diminish along with the flavor.

None of this makes oxidized gum dangerous. It’s just worth knowing about if you plan to store mastic gum for longer than a year or two.

Tips for storing mastic gum

Stored in a cool, dry place away from direct sunlight and moisture, mastic gum keeps its quality for years.

Sealed, unopened packaging prolongs its shelf life by keeping out air, moisture, and light.

For the best experience, chew mastic gum within a year of opening the tin. Gum past the date on the packaging is still safe to chew, just duller in flavor and likely less potent.

If you have any concerns about chewing mastic gum, check with a healthcare provider.

If you’re curious what mastic gum tastes like, or about the difference between nuggets and droplets, we’ve covered both.

This article originally appeared online in 2024; it was most recently updated on July 2, 2026, to include current information.

Jillian Levy

Jillian Levy is a seasoned health writer and certified health coach with a decade of experience crafting informative content for leading health, wellness, and personal development brands.