The evaluation questionnaire (at baseline, and follow-up), the exit interview (at baseline), and screening at follow-up were collected digitally offline in ODK, while the Y-Check screening data (at baseline) were collected in a bespoke application on android tablets. A small amount of data was collected on paper (referral forms, laboratory results, oral health charts, and referral forms) and double-entered into ODK. The tablets were synchronized at the end of every day at BRTI research centre offices.