Schoolchildren, aged 6-8 years old, from the six public schools of a deprived suburban area of Brasília, Brazil will be recruited. In the stage 1 of the study, an epidemiological survey of the oral health status and an anthropometric evaluation of the children will be performed. Potential patient for study's stage 2 will be recruited. Quality of life surveys, patterns of oral hygiene and socio-demographic data will be collected.