A college student complains of bleeding gums in some areas while brushing. Calculus is visible on the lingual surfaces of the lower incisors and the buccal surfaces of the upper molars (areas near the salivary duct openings). What is the best treatment plan?

This presentation (a young, otherwise healthy patient with bleeding and localized supragingival/subgingival calculus near the major salivary duct orifices, without mention of deep pockets or bone loss) describes gingivitis, not periodontitis. The appropriate conservative initial management is a routine prophylaxis plus oral hygiene instruction — full-mouth scaling and root planing (a treatment for periodontitis with attachment loss) would be overtreatment for simple gingivitis.