Maintenance therapy after active periodontal treatment involves regular recall visits and re-evaluations by the dental team to prevent recurrence of periodontal disease. The goals are to maintain healthy teeth and gums for life through controlling factors like plaque, treating new issues early, and reinforcing proper home care. Regular recall visits every 3 months initially, extending longer as periodontal health improves, allow monitoring and early treatment if disease recurs due to causes like incomplete plaque removal or failure to follow the recall schedule.