How many molars are in the four quadrants of the maxillary and mandibular arches?

In the human dentition, each quadrant of the maxillary and mandibular arches contains three molars. Therefore, there are a total of 12 molars in the entire mouth, with 6 in the maxillary arch (3 per quadrant) and 6 in the mandibular arch (3 per quadrant).