Final answer:
The teeth that typically erupt at age 6 or 7 with many pits and fissures are the molars. These are the first permanent molars that aid in grinding food and represent a growth milestone in children's dental development.
Step-by-step explanation:
Types of Teeth and Their Eruption
The teeth that normally erupt at age 6 or 7 and contain many pits and fissures are the molars. These teeth are the most posterior and are larger than the other types of teeth in the mouth. The first permanent molars usually appear around this age, following the deciduous (baby) teeth. They have several pointed cusps which are used to crush food so it is ready for swallowing. The primary function of these molars is to grind down food during the chewing process. It's important for children at this age to learn good dental hygiene to take care of these new permanent teeth.
Middle childhood is a significant period in dental development. During this time, the deciduous teeth, which include the eight incisors, are replaced by 32 permanent teeth. The first teeth to be lost are generally the incisors, but it is the arrival of the first molars that marks the beginning of permanent teeth emerging, signaling an important growth milestone in children.