Archaeologists in Sweden and Denmark have uncovered fragments of chewed birch pitch, also known as betulin, that are between 5,700 and 10,000 years old. These materials were found at sites such as Huseby Klev in Sweden and Syltholm in Denmark. The fragments bear tooth marks, indicating they were chewed by humans. This discovery provides a rare glimpse into the lives of people from the Mesolithic period, a time when humans were primarily hunter-gatherers. At the Huseby Klev site, genetic analysis of the chewed resins revealed three distinct DNA samples. These samples belonged to two young females and one male, all between the ages of 5 and 18, with some adult marks also present. This suggests that chewing birch pitch might have been a shared activity among different age groups in the community. At Syltholm, a 5,700-year-old piece of resin contained preserved saliva, allowing researchers to reconstruct a complete human genetic profile. This is one of the oldest known genetic profiles from a single individual. Birch pitch, a sticky substance derived from birch bark, was commonly used by prehistoric people as a natural adhesive for assembling tools and weapons. The presence of tooth marks on the fragments suggests that chewing birch pitch was a widespread practice. This might have been a way to soften the material for use, or it could have had social or medicinal significance. The discovery challenges previous assumptions about the daily lives and social structures of Scandinavian hunter-gatherer populations. It suggests that these communities had complex social interactions and shared practices, such as chewing birch pitch. The findings also highlight the importance of oral traditions and communal activities in early human societies. This research adds new layers of understanding to the lives of people who lived thousands of years ago in Scandinavia.