Purpose To study Oral Health related Quality of Life (OHRQoL) of pre-school children and its associated factors. Methods Cross-sectional study with sample data collected through an on-line questionnaire to a non-probabilistic sample. The questionnaire included the Portuguese version of the Early Childhood Oral Health Impact Scale (ECOHIS) and questions about sociodemographic characteristics, oral health behaviours, and reported oral health of the child. Data analyses included descriptive statistics, Mann-Whitney and Kruskal-Wallis tests and Linear regression (α = 0.05). ResultsThe sample consisted of 1475 parents of pre-school children (3-5 years-old), residing in Portugal. The mean ECOHIS total score was 1.5 (sd = 3.4). In the bivariate analysis the child's age, starting toothbrushing after one year of age, frequent intake of sugary food and drinks, previous appointment with an oral health professional, all reported of oral health problems, and a negative perception of oral health were negatively associated with OHRQoL (p < 0,05). In the regression model the factors that most contributed to a worse quality of life were dental caries and abscess, contributing to an ECOHIS average increase of 2.56 and 3.34, respectively. Conclusions The studied population presented a good OHRQoL, with the item related to pain being the most relevant for the ECOHIS score. Worst OHRQoL was found in older children, whose parents negatively rated the children's oral health and with reported dental caries, trauma, and abscess.

Objectives: This study aimed to evaluate oral health and factors that may influence it in individuals with Asperger’s syndrome. Methods: This observational cross-sectional study was divided into two stages: a question- naire and an oral examination, using the decayed-missing-filled index, the gingival index, and the simplified oral hygiene index. Data were analyzed using SPSS® software (version 26.0), considering a significance level of 0.05. After verifying the non-normality with the Kolmogorov-Smirnov test, the Mann-Whitney and Kruskal-Wallis tests were used. Results: The investigation included 23 adults with Asperger syndrome. A decayed-miss- ing-filled index of 2.65(±2.81), a gingival index of 1.06(±0.36) and a simplified oral hygiene index of 2.08(±0.73) were found. Most respondents (60.8%) brushed their teeth twice a day. Individuals with higher brushing frequency and those who recently had an oral appointment had lower calculus deposits (p=0.038 and p=0.021, respectively). Conclusions: The individuals had a low dental caries prevalence, mild gingival inflammation, and a fair oral hygiene status. Although there are factors capable of influencing the oral health of these individuals, good results can be obtained if adequate oral hygiene habits are maintained, namely brushing twice a day.