Left untreated, what's termed "early dental caries" -- the first stage of tooth decay -- can destroy tiny teeth and lead to infection, pain, and lifelong consequences.
They are almost reduced to the plan, but, through the remains of towns, of canals and roads, it is possible to observe the evolution of this interaction of cultures stage by stage, from the very beginning to the period of final decay, when the Eurasian route lost its importance and the towns their economical role.