Folding your tongue is not a purely genetic trait, and the same goes for tongue rolling. Despite what many of us learned in biology class, there is no strong evidence that a single gene controls whether you can perform these tongue tricks. The reality is more nuanced: genetics may play a partial role, but practice, age, and learned motor control matter just as much or more.
Why the “Genetics” Story Stuck
The idea that tongue rolling is a simple inherited trait traces back to geneticist Alfred Sturtevant, who proposed in 1940 that a dominant gene controlled the ability. The concept was clean and easy to demonstrate in a classroom, so it became a staple of introductory biology courses worldwide. But Sturtevant himself later walked back that claim. He noticed that some people, especially children, couldn’t roll their tongues when first asked but learned to do so later. By 1965, he acknowledged that tongue rolling was not determined solely by genetics.
A key study published in the Journal of Heredity found no evidence for a genetic basis of tongue rolling. And a twin study by Martin in 1975 delivered what many consider the strongest blow to the genetic theory: identical twins, who share 100% of their DNA, were no more likely to both be tongue rollers than fraternal twins. If the trait were genetic, identical twins should match far more often. They didn’t.
Tongue Rolling vs. Tongue Folding
It helps to distinguish between two different tricks people often lump together. Tongue rolling means curling the sides of your tongue upward to form a tube or taco shape. Tongue folding means bending the tip of your tongue backward on itself. These use different muscle groups and have very different prevalence rates.
Across populations, roughly 60 to 80% of people can roll their tongues. A large Dutch study found the rate was 83.7% in their sample. Tongue folding is far rarer. Global estimates put it between 1.5 and 3%, though the same Dutch study recorded a higher rate of 27.5%, possibly due to differences in how folding was defined or tested. Other complex movements are uncommon too: only about 14.7% of people in that study could make a cloverleaf shape, and around 36% could twist their tongue to one side.
How Your Tongue Actually Does This
Your tongue contains eight muscles divided into two groups. The extrinsic muscles anchor your tongue to surrounding bones and control its position, moving it forward, backward, and side to side. The intrinsic muscles, which exist entirely within the tongue itself, are the ones responsible for changing its shape.
Four intrinsic muscles work together to produce different tongue tricks. The superior longitudinal muscle runs along the top surface from base to tip and curls the tip upward. The inferior longitudinal muscle runs along the bottom and curls the tip downward. The transverse muscle stretches from a central divider to the outer edges and narrows the tongue when it contracts. The vertical muscle runs top to bottom and flattens the tongue. Rolling your tongue into a tube requires coordinated narrowing (transverse muscle) and upward curling of the edges, while folding relies more on the longitudinal muscles that bend the tip backward.
Children Learn It Over Time
One of the clearest signs that tongue folding and rolling aren’t hardwired is that children acquire these abilities gradually. A study of Japanese schoolchildren found that 54% could roll their tongues at ages 6 to 7, but by age 12, that number climbed to 76%. That means over 20% of the children in that study learned to tongue-roll during those years, without any change to their DNA. This pattern is consistent with motor skill development: as children gain finer control over small muscle groups, they unlock movements that were previously impossible for them.
Tongue-rolling exercises are even used in speech and swallowing therapy. Children practicing orofacial exercises are asked to roll their tongue into a taco shape and hold it protruded for 10 seconds, repeating the exercise multiple times. The fact that this can be trained and improved through repetition reinforces that it’s a motor skill, not a fixed genetic outcome.
So What Role Does Genetics Play?
None of this means genetics are completely irrelevant. People inherit different tongue lengths, muscle fiber distributions, and connective tissue flexibility, all of which could make certain tongue movements easier or harder for a given person. Think of it like flexibility in general: some people can touch their toes easily thanks to their body proportions and tissue elasticity, but most people can get there with stretching. The underlying anatomy has a genetic component, but the ability itself is trainable.
What scientists have ruled out is the simple story: one gene, dominant or recessive, that determines whether you can or can’t fold or roll your tongue. The trait doesn’t follow predictable inheritance patterns. Two non-rolling parents can have rolling children, and two rolling parents can have non-rolling children, at rates that don’t match any single-gene model. The best current understanding is that tongue tricks result from a combination of inherited anatomy, neuromuscular development, and practice.
Can You Learn to Do It?
If you can’t currently fold or roll your tongue, there’s a reasonable chance you can learn. Start by practicing in front of a mirror. For rolling, try pressing the sides of your tongue against your upper molars and gently curling upward. For folding, press the tip of your tongue against the roof of your mouth and try to push the tip backward. Many people find that what felt impossible at first becomes achievable after days or weeks of casual practice. Children who couldn’t do it at age 7 figured it out by 12 without any formal training at all.
That said, not everyone will get there. Individual differences in tongue muscle structure, the flexibility of the connective tissue beneath the tongue, and the density of nerve endings that allow fine motor control all vary from person to person. Some people may find certain tongue movements permanently out of reach, not because of a single “tongue folding gene,” but because of the cumulative effect of their particular anatomy.