Anesthesia, General Caries risk assessment Child Child, Preschool Dental Caries Health Knowledge, Attitudes, Practice Humans Infant Oral Hygiene Parents Patient Education as Topic Pilot Projects Recurrence Risk Assessment Saliva Secondary Prevention Socioeconomic Factors Surveys and Questionnaires attitude to health caries recurrence child child parent relation dental caries education general anaesthesia general anesthesia human infant microbiology mouth hygiene