500
Your patient has 5 mm of recession of the gingival margin on the maxillary second premolar. The probing depths for this tooth range from 2 to 3 mm. The proximal surfaces are experiencing continued attachment loss. Clinically, you see heavy plaque on the proximal surfaces of the roots of this tooth. The patient flosses daily. This could be the cause of these problem areas.
What is floss will not disrupt plaque biofilm in root concavities.