People all over the world eat clay. There are many scientific works praising the virtues of clay. Even today in Chernobyl, clay is used to decontaminate drinking water. Prehistoric man already ate clay.
Indications of clay
Early tooth decay in children under 6 years of age is a major public health problem. We don't see them coming, parents wrongly think that they don't need to be treated and they can be a traumatic experience for the child.