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AimTo compare oral health indicators of children/adolescents with Down syndrome (DS) with a group of children/adolescents without DS.Methods and ResultsThis cross‐sectional study included 144 individuals with DS, ages 4 to 18 years, matched for age and sex with a group of 144 individuals without DS, and their parents/caregivers. Parents/caregivers completed a questionnaire regarding sociodemographic information and habits related to their children's oral health. Clinical examination of the children/adolescents evaluated dental caries experience (DMFT/dmft), bleeding on periodontal probing, presence of visible plaque, clinical consequences of untreated dental caries (PUFA/pufa), and malocclusion (DAI). The chi‐square test, linear by linear test, and Mann‐Whitney test were used to compare the variables between the groups (p < .05). Children/adolescents without DS brushed their teeth more times per day (p < .001) and had a higher frequency of daily sugar intake (p < .001). The children/adolescents in the DS group had a greater presence of gingival bleeding (p < .001) and had a greater number of cases of “severe malocclusion” and “very severe malocclusion” (p = .001). No difference was found in the prevalence of dental caries between the two groups.ConclusionThe children/adolescents in the DS group had a greater presence of gingival bleeding during the clinical examination and had a greater need for orthodontic treatment.