How many teeth are typically present in the mouth of an 8-year-old child?

At age 8, children are in mixed dentition. The permanent teeth that have typically erupted include: 4 first permanent molars (erupted around age 6), 4 mandibular central incisors (age 6–7), 4 maxillary central incisors (age 7–8), and 4 lateral incisors (beginning around age 7–8) — totaling approximately 8–12 permanent teeth. The remaining deciduous teeth (canines and first/second deciduous molars) are still present. An approximate count at age 8 is 8–12 permanent plus 8–12 deciduous teeth, totaling around 20 teeth. The exact number varies with eruption timing, but approximately 12 permanent and 8 deciduous is a reasonable representation.