Effect of Probiotics on the Periodontal Status of Orthodontic Patients

Inclusion Criteria: * adolescents aged 12 to 16 benefiting from social security coverage * in good general health in brushing and taking treatments * Have FODs * who consent to the study and whose parents have given their consent * suitable for orthodontic treatment in view of his oral state Exclusion Criteria: * inability to obtain informed consent * use of another probiotic or toothpaste / antiseptic mouthwash ≤ 1 month before inclusion * allergy or hypersensibiliity to the active substance or to any of the excipients listed in the Gum® PerioBalance® user guide) * no history of antibiotic therapy, antiseptic mouthwash ≤ 1 month before inclusion * medical contraindication (immunosuppression, pathology requiring prophylactic antibiotic therapy before dental care) * physiological, pathological condition, medication or behavior that may have repercussions on the oral cavity (eg: pregnancy, diabetes, antiepileptics, tobacco) * oral state requiring other priority care (untreated cavities, untreated active periodontitis, progressive recession)