Final answer:
The human mouth has 20 deciduous (baby) teeth and 32 permanent teeth. Deciduous teeth start to emerge around 6 months of age and are gradually replaced by permanent teeth starting at age 6. Wisdom teeth are the last to emerge, often in late adolescence or early adulthood.
Step-by-step explanation:
In the human, the number of deciduous teeth is 20; the number of permanent teeth is 32. Deciduous teeth, also known as baby teeth, are the first set of teeth that emerge during infancy and early childhood. These teeth are lost and replaced by permanent teeth during middle childhood. Permanent teeth consist of different types, including 8 incisors, 4 canines, 8 premolars, and 12 molars, and they are the second set of teeth that emerge mainly during middle childhood and replace the deciduous teeth after they are lost.
During the course of a human's lifetime, two sets of teeth develop in stages. The deciduous teeth are generally the first to come in, beginning around 6 months of age. As children grow, these teeth will be replaced with permanent teeth which start coming in around age 6 and finish by the early teenage years, except for the wisdom teeth that may emerge in late adolescence or early adulthood.