A 13-year-old girl has been experiencing gingival hemorrhages and frontal teeth mobility throughout the last month. Objectively: gingival mucous membrane in the region of lower incisors and canines is edematic, hyperemic, it bleeds on touch. These teeth present with I degree mobility, parodontal pouches are 3 mm deep. Orthopantomogram shows reduction of bone tissue of interalveolar septa by 1/3 of their height. Frontal teeth of the lower jaw are overcrowded. Hygiene index is 4,2. What local treatment should be provided in the first place?