Here's a fun thought next time you're chewing a stick of gum: you are taking part in one of the oldest, weirdest, most stubbornly persistent human habits on record. Long before there was a wrapper to peel or a flavour to pick, our ancestors were already gnawing away on tree resin — for thousands and thousands of years, on more than one continent, entirely independently of each other. Humans, it turns out, just really like chewing on something.
So let's take a trip through the genuinely wild history of chewing gum: from Stone Age teenagers in Sweden, through Mayan thirst-quenchers and an exiled Mexican general, all the way to a Philadelphia accountant who invented bubble gum completely by accident.
The Original Chewing Gum Wasn't Gum at All
The oldest evidence of humans chewing something gum-like comes from Huseby Klev, an archaeological site on the west coast of Sweden. There, researchers found small wads of chewed birch bark tar, or pitch, dating back roughly 9,500 to 9,900 years — well into the Mesolithic period. The pitch still bore clear tooth marks, and because it had been soaked in saliva, scientists were able to extract and sequence DNA from it, identifying that at least three individuals (two female, one male) had chewed the wads. Analysis published in the journal Scientific Reports even revealed signs of gum disease in their ancient mouths.
Why chew tar in the first place? Birch bark pitch was mainly used as a glue for hafting stone tools, and researchers believe it was softened by chewing before use — and possibly chewed for its mildly antiseptic properties too, since birch tar contains phenols that can help fight infection.
Sweden wasn't alone. Ancient Greeks chewed resin from the mastic tree to clean their teeth and freshen their breath. Northern Native American communities chewed spruce tree resin, a habit later adopted by European settlers. Different cultures, oceans apart, all landed on roughly the same idea: find a chewy tree resin, and chew it.
Enter Chicle: The Maya and Aztec Connection
The gum most of us would actually recognise starts with chicle, a milky latex tapped from the bark of the sapodilla tree (Manilkara zapota), native to southern Mexico and Central America. The Maya cut diagonal grooves into the bark and collected the sap, which they boiled and dried into a substance called "cha" — chewed to quench thirst and stave off hunger. The Aztecs, who came later, valued chicle mainly as a breath freshener, but they were surprisingly strict about who got to chew it in public: unmarried women and children could chew openly, while adult men doing so in public were looked down on, and women who chewed in public were considered improper.
From Rubber Experiment to Chewing Gum Empire
Chicle's journey into modern chewing gum involves one of history's odder cameos: Antonio López de Santa Anna, the exiled former president of Mexico (yes, the general from the Battle of the Alamo). Living in New York in the 1860s, Santa Anna supplied a stockpile of chicle to inventor Thomas Adams, hoping Adams could vulcanise it into a cheap rubber substitute for things like carriage tyres. The rubber experiment flopped completely.
But Adams noticed Santa Anna chewing plain chicle to pass the time, and had a better idea. He began boiling and hand-rolling the chicle into small balls of chewing gum, selling his first batch in 1871. It caught on. By the late 1880s, Adams' company was producing around five tons of chewing gum a day, and in 1871 he patented a gum-making machine that helped kick off the industrial-scale gum business.
Meanwhile, in Maine, John Curtis had already built what's considered the world's first chewing gum factory in the 1850s using boiled spruce resin — but spruce gum was brittle and inconsistent, and it was chicle that ultimately won out as the industry standard.
William Wrigley Jr. and the Marketing Masterstroke
Chicle gum might have stayed a modest novelty if not for William Wrigley Jr., a former soap salesman with a serious talent for marketing. Wrigley originally gave away gum as a free bonus with soap orders — and noticed customers wanted the gum more than the soap. He pivoted the whole business, launching Wrigley's Spearmint and, in 1893, Juicy Fruit, then poured enormous effort into advertising, at one point mailing free samples to millions of Americans.
Wrigley also convinced the U.S. military to include chewing gum in soldiers' ration kits during the First World War, officially to help with dental hygiene, but also to ease nervousness and stave off hunger and thirst on the front line. It turned out to be a masterstroke: soldiers came home with the habit, and gum went from a niche treat to a genuine household staple. By 1932, Wrigley was one of the wealthiest men in America.
The Accidental Invention of Bubble Gum
Bubble gum, somewhat brilliantly, was invented by a complete amateur. In 1928, Walter Diemer, a 23-year-old accountant at the Fleer Chewing Gum Company in Philadelphia, was experimenting with gum recipes in his spare time (not officially his job) when he landed on a formula that was noticeably more stretchy and less sticky than regular chewing gum — perfect for blowing bubbles.
He mixed up a 300-pound test batch and dyed it with the only food colouring on hand at the factory that day: pink. That's the entire reason bubble gum is traditionally pink to this day — not clever branding, just what was in the cupboard. The first hundred pieces were wrapped in taffy paper and sold at a Philadelphia candy shop on 26 December 1928, under the name Dubble Bubble. It was an immediate hit.
Chicle Runs Out, Science Steps In
By the 1920s, Americans were chewing through around 105 sticks of gum per person, per year, and that demand hit the sapodilla forests of Mexico and Central America hard. Unsustainable tapping is estimated to have destroyed roughly a quarter of Mexico's sapodilla trees by the mid-1930s, and supply couldn't keep up. Manufacturers gradually shifted to synthetic, petroleum-based gum bases — polymers such as polyethylene and polyvinyl acetate. Wrigley kept using natural chicle until the 1960s before finally switching over. By 1980, chicle imports to the United States had essentially stopped altogether.
Modern Gum: Sugar-Free and Everywhere
The next big shake-up came from the sugar-free side of the aisle. Xylitol, a sugar substitute first identified by German chemist Emil Fischer back in 1891, was revived in Finland during WWII sugar shortages and later shown by researchers at the University of Turku in the early 1970s to actively help reduce tooth-decay-causing bacteria. The world's first xylitol chewing gum launched in Finland in 1975, and sugar-free gum has been a mainstream category ever since — a far cry from the treacly chicle balls Thomas Adams was hand-rolling in the 1870s.
A Quick Timeline of Chewing Gum
- ~9,500-9,900 years ago: Mesolithic teenagers in what is now Sweden chew birch bark pitch, leaving behind DNA-rich wads discovered by archaeologists.
- Ancient Greece: Mastic tree resin chewed for dental hygiene and breath freshening.
- Pre-1500s: Maya and Aztec peoples in Mesoamerica chew chicle from the sapodilla tree.
- 1850s: John Curtis opens the first commercial chewing gum factory in Maine, using spruce resin.
- 1871: Thomas Adams begins commercial production of chicle-based chewing gum in New York.
- 1893: William Wrigley Jr. launches Juicy Fruit and Wrigley's Spearmint.
- 1928: Walter Diemer accidentally invents bubble gum at the Fleer Chewing Gum Company, dyeing it pink by default.
- 1960s-1980: Manufacturers switch from natural chicle to synthetic gum bases as sapodilla supply collapses.
- 1975: The first xylitol (sugar-free) chewing gum launches in Finland.
Still Going Strong
What's genuinely remarkable about chewing gum is how little the core idea has changed. Swap chicle for a synthetic gum base, swap birch tar for spearmint flavouring, and you're still doing more or less exactly what those Mesolithic teenagers in Sweden were doing nearly ten thousand years ago: popping something chewy in your mouth and working your jaw for the simple, satisfying feel of it.
So next time you unwrap a stick, spare a thought for the chicleros of Mexico, the accountant with a pink dye and a lot of spare time, and the long, slightly sticky thread connecting your gum to the Stone Age.
References
- Smithsonian Magazine. A Brief History of Chewing Gum.
- History.com. Chew on This: The History of Gum.
- Popular Science. Chew on This: The 10,000-Year History of Gum.
- Kashuba, N. et al., Scientific Reports (via NCBI). Metagenomic Analysis of Mesolithic Chewed Pitch Reveals Poor Oral Health Among Stone Age Individuals.
- History Facts. Bubble Gum's Color Comes From the Only Dye the Inventor Had.
- Peppersmith. The History of Xylitol in Finland.