The document describes a case study of a 26-year-old female patient who complained of mild occasional pain and food lodgment in her upper right back tooth. Upon examination, the dentist found an overhanging amalgam restoration with food lodgment and mild bone loss in tooth 16. Radiographs revealed secondary caries under the restoration in tooth 16 and class II caries in tooth 17. The dentist diagnosed secondary caries in tooth 16, class II caries in tooth 17, and chronic localized periodontitis in tooth 16. The treatment plan involved subgingival scaling, composite restorations for teeth 16 and 17. The document also summarizes several studies related to proximal contacts between teeth and their relationship to periodontal disease