Background: The Child Perceptions Questionnaires (CPQ 8-10 and CPQ 11-14 ) are indicators of child oral health-related quality of life. The aim of this study was to assess the validity and reliability of the self-applied CPQ 8-10 and CPQ [11][12][13][14] in Brazilian children, after translations and cultural adaptations in the Brazilian Portuguese language.
Parents' dental health habits influence their children's oral health. Oral health education programs aimed at preventive actions are needed to provide children not only with adequate oral health, but better quality of life. Special attention should be given to the entire family, concerning their lifestyle and oral health habits.
There is a relationship between clinical oral health status and HRQoL in children. In the studies that suggested weak relationships between children's oral conditions and HRQoL, the explanations were low disease levels in the sample, the conditions under investigation may have caused immeasurably low levels of impact or the impacts were mediated by inter- and intravariables according to culture and education. Moreover, relationships between biological or clinical variables and HRQoL outcomes are not direct, but mediated by a variety or personal, social and environmental variables, as well as by the child development, which have influence on the comprehension about the relationship among health, illness and QoL. So, longitudinal studies are necessary to determine validity, responsiveness and minimal clinically important difference.
Valid and reliable information can be obtained from parents and children using appropriate questionnaire techniques. Although the parents' reports may be incomplete due to lack of knowledge about certain experiences, they still provide useful information.
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