The article is devoted to the issue of early orthopaedic rehabilitation of youngest preschool children with ectodermal dysplasia and congenital edentulism. The essence and details of children’s psychophysiological development at this age are revealed, as well as main pedagogical tools making it possible to adapt the children to the specific environment of the dental clinic and motivate them for undergoing long-term multistage orthopaedic dental treatment. Clinical approaches and peculiarities in the dentist’s work with children of different psychological types as well as particular aspects in their adaptation to removable dentures are described. Two clinical cases of effective orthopaedic rehabilitation of 3-years-old children with ectodermal dysplasia and congenital edentulism using full removable lamellar dentures.