Study to determine if whether or not exist an association between the tissue loss (ETW progression) and the frequency of an acidic diet. To accomplish the aim, a quantitative analysis of intraoral scans of study models will be performed to identify erosive tooth wear progression in a group of Chilean adolescents.

First, participants with different intake of dietary acids will be compared in terms of their baseline sociodemographic and clinical characteristics. Second, the association between baseline frequency of dietary acids and changes in volume loss over time will be evaluated using linear mixed models to account for the data structure (repeated assessments nested within teeth and teeth nested within children). Models will be adjusted for demographic factors, family socioeconomic position, health behaviours and chronic conditions.

Inclusion Criteria:

• Male and female (age range 10-18) assisting in a school with low socioeconomic status.

They must have: -Complete record of questionnaires

• Baseline and Follow-up Intra oral scanners (with correct alignment when using Wearcompare software)
• BEWE scores
• Signed Inform consent

Exclusion Criteria:

• Patients not willing to participate
• Patients wearing orthodontic appliances

Adolescents subscribed at 2 Chilean high schools of the Community La Pintana, Santiago de Chile (Colegio Nocedal and Colegio Almendral). Schools belong to a low socio economic status sector.