Efficacy of Guided Biofilm Therapy in Pediatric Patient

The present parallel randomized clinical trial aims to assess the efficacy of a plaque disclosing agent (PDA) and air-flowing with erythritol powder (Guided Biofilm Therapy) in the removal of biofilm and plaque in paediatric participants during professional oral hygiene, compared with ultrasonic debridement. The participants will be divided in four groups and receive: * Guided Biofilm Therapy with plaque disclosing agent (GBT+) * Guided Biofilm Therapy without plaque disclosing agent (GBT-) * Ultrasonic debridement and polishing with plaque disclosing agent (US+C+) * Ultrasonic debridement and polishing without plaque disclosing agent (US+C-) Clinical and image software analysis (ImageJ) of residual plaque will be performed.