A 14-year-old child has been lately complaining about overgrowth and permanent bleeding of gums during tooth brushing. Objectively: gingival papillae in the anterior part of both jaws are swollen, hyperemic, overlap the tooth crowns by 1/3 of their height, bleed easily during the instrumental examination. Caries intensity is of average level. Hygiene of the oral cavity is not satisfactory. In this case it is advisable to recommend a toothpaste containing: