Norway passed legislation in 1998 banning bare metal from playground equipment — a policy that itself speaks to how seriously the country took a problem most people treat as a punchline. Now, for the first time, the underlying science has been examined in a formal academic context.
Anders Hagen Jarmund, a graduate student at the Norwegian University of Science and Technology (NTNU), drew on his own childhood experience to investigate the phenomenon known as “tundra tongue” — a term first coined in a 1996 case study. His research produced two separate papers: one published in the International Journal of Pediatric Otorhinolaryngology and another in Head & Face Medicine.
“I’m from a small place called Hattfjelldal, which is quite cold in the winter,” Jarmund said. “I don’t remember if it was a signpost or a lamppost behind the school, but I remember licking it, and my tongue got stuck.”
What the historical record shows
The research team reviewed newspaper accounts from Norway, Sweden, and Denmark, identifying 113 unique cases. The earliest dates to 1845, when a French schoolboy froze his tongue to a metal bridge and lost skin on both his tongue and lips when he pulled free. Cases peaked in the 1950s.
Nearly all incidents involved children between the ages of 1 and 16, with 60 percent of them boys. Almost every case occurred outdoors, with two notable exceptions — one involving an indoor refrigeration system, and another where children suffered tongue lacerations from ice cream stored on dry ice. The authors described the latter as a “mass casualty event.”
Among the more memorable cases: a child whose tongue adhered to a metal railway line. The approaching train switched tracks in time, and the boy eventually came free. The researchers also noted a 1927 urban myth from Indiana about a man decapitated by a train after his tongue stuck to a rail — a story that circulated widely but without verified basis.
Remedies deployed across documented cases included warm water, glycerol, coffee, whiskey, a penknife, a car cigarette lighter, and hot denatured alcohol. Police and fire departments were frequently called. Most victims experienced mild bleeding and pain, though more serious outcomes included sutures, infection risk, facial scarring, and in some cases the possibility of tongue amputation.
The mechanics behind the freeze
The physical mechanism is straightforward, according to the research: saliva and moisture on the tongue freeze on contact with cold metal, forming an ice bridge between the two surfaces. What had not previously been studied experimentally — at least not in any meaningful depth, according to the report — was the precise force required to detach a tongue, or whether a specific temperature range carries the greatest risk.
To test this, Jarmund and colleagues constructed an experimental setup using a force meter, temperature sensors, a frozen section of a light post, and a pig tongue held at body temperature.
The next step, according to the research, is to analyze the data from those experiments to determine at what temperatures adhesion is strongest and how much force the tongue tissue can withstand before sustaining damage.
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