Dental and medical treatments and methods, including treating gum disease, using peroxide gel and a viscous antimicrobial including a topical antibacterial agent, a topical antiviral agent, a topical antibiotic, a topical antifungal agent, a topical antiseptic agent, or a topical anti-intermicrobial agent to chemically debride and curettage a treatment area. Treatments and methods include non-surgically scaling and root plaining the treatment area with dental tools such as periodontal scalers and/or curettes during the active period of the chemical debridement. The working surfaces of dental and medical tools can be sharpened for optimal root and tooth surfacing during treatment. Treatment can include instructions for co-therapy by or on behalf of treatment subjects between visits and for maintenance care.