 Aim: The primary aim of the study is to explore if an educational intervention including information, counselling and support provided at early stage to families affected by major CHD, or CHD combined with a syndrome, can increase the awareness of the importance of maintaining of good oral health, and avoid the development of poor oral health including dental caries, leading to less dental anxiety and a higher oral heath related quality of life. The secondary aim is to elucidate factors associated with the development of poor oral health andor orofacial dysfunction as well as family attitudes and needs of support. 