Final answer:
Most teeth develop from four development lobes, which fuse to create the various features of the tooth. Deciduous teeth emerge around 6 months of age, permanent teeth replace them from age 6 to 12, and wisdom teeth usually emerge in early adulthood.
Step-by-step explanation:
Most teeth develop from four development lobes. These lobes are the primary growth centers where the tooth begins to form, and as the tooth matures, these lobes fuse to create the cusps and ridges of the adult tooth. Each type of tooth has a characteristic number of lobes; for example, incisors usually have three to four lobes, while canines typically have four lobes. Molars can have more complexity, with the large permanent molars featuring multiple lobes that correlate to their cusps, which can be as many as five or more depending on the specific tooth.
Deciduous teeth, also known as baby teeth, usually begin to appear at about 6 months of age. As a child grows, these teeth are replaced by permanent teeth, which start to come in between approximately age 6 and 12. Wisdom teeth, which are the third set of molars, generally emerge in early adulthood; however, they sometimes may remain impacted and require removal by orthodontic surgery if they do not properly erupt.