Current study, carried out at the Pediatric Dentistry Clinic, characterizes behavioral problems and stress manifestations in children undergoing dental treatment and identifies possible links between children's cooperation in dental procedures. Manifestations of stress in the accompanying person and in the dental student practicing the treatment were identified, showing the manner they influence the child behavior during the procedure. One hundred and ten children, 110 accompanying persons and 70 students participated in the study. The following instruments were applied: Child Stress Scale, Rutter Parent Scale A2, Lipp Stress Symptoms Inventory, and Dental Fear Survey. Since dental treatment was permeated with stress manifestations by children, accompanying persons and dentistry students, such conditions did not favor the dentistry students' learning or the children's cooperative behavior. Manifestations were present regardless of the invasiveness degree of the procedure.