den· tist ˈden-təst : one who is skilled in and licensed to practice the prevention, diagnosis, and treatment of diseases, injuries, and malformations of the teeth, jaws, and mouth and who makes and inserts false teeth

Brushing your teeth does not imply you are a dentist.

sci·ence noun 1. the systematic study of the structure and behavior of the physical and natural world through observation, experimentation, and the testing of theories against the evidence obtained. "the world of science and technology"

A child may not be a good scientist, but they observe, experiment and explore their ideas. That sounds like science to me. Observational learning is a very common way scientist begin to understand things.