Supplementary Material for: Early counselling to improve oral health behavior in children with major congenital heart defects – a randomized controlled trial

Maintaining optimal oral health behavior in children with a congenital heart defect (CHD) is important in managing the risk for caries development and infective endocarditis. The aim of this study was to evaluate the impact of an early and repeat oral health promotion intervention (OHPI) among of children with major CHD. Randomized controlled trial including 72 out of 91 children born in Finland 1.4.2017-31.10.2020 with a) major CHD potentially included in the criteria of endocarditis prophylaxis or b) any CHD with surgical repair combined with a chromosomal syndrome. A parallel passive control (C) group of 87 healthy children were recruited at birth. CHD children were randomized 1:1 to intervention (CHD-I) and control (CHD-C) groups. The OHPI included counselling by motivational interviewing, home delivered toothpaste and toothbrushes, and written information, and was provided at baseline, 6, 12, and 18 months of age to CHD-I group. The primary outcome measure at 24 months was child’s oral health behavior (toothbrushing, sugar intake, and dental care contact). The secondary outcome measures were parents’ awareness of the importance of oral health behavior, and oral health behavior as a predictor for child behavior. At 24 months, toothbrushing was performed twice a day in 20/27 (74%) among CHD-I, in 13/30 (43 %) among CHD-C (CHD-I vs CHD-C p=0.031), and in 37/50 (74 %) among healthy comparisons (CHD-C vs C p=0.009). Electric toothbrush use was 12/27 (44 %) in CHD-I, 5/30 (17 %) in CHD-C (CHD-I vs CHD-C p=0.041), and 7/50 (14%) in healthy comparison (CHD-C vs C p=0.756) children. Among CHD-I, toothbrushing and use of electric toothbrush improved between 12 months and 24 months. Sugar drink intake was more common among CHD-C (CHD-C vs C p=0.015), but comparable to CHD-I children. Parental toothbrushing predicted child toothbrushing twice a day. There were no statistical group differences in dental care contact. Children with CHD are at risk for poor oral health behavior. This could be improved with early and repeat oral health promotion parental counselling.