Around 20% of children under five and 50% of children aged 6-11 are affected by tooth decay, according to the American Academy of Pediatric Dentists.
Specifically, children from around age 2 to 5 years old had three primary teeth that had fillings and two that were decayed in 2011–2016.
Adults from around age 20 to 64 years, on the other hand, had an average of 9.3 decayed, missing, or filled teeth in 2011–2016, according to the National Institute of Dental and Craniofacial Research.