Their teeth were infected to such a degree that it is visible in their skeletons, although caries was seldom the cause. The molars (grinders) in their mouths were worn down almost to the gum, because they ate bread, porridge, and other products made from grain that had been threshed on the ground. Dust and sand thus were mixed in with the grain, which wears down the teeth. In the cemetery from Fjälkinge with 128 carefully examined Viking Age skeletons, people over age sixty had lost, on average, two-thirds of their teeth.