This document discusses preventive orthodontics procedures including caries control, care of deciduous dentition, eliminating occlusal interference, education of patients, and space maintenance. It emphasizes the importance of prevention and early intervention to preserve the dental arch and proper eruption of permanent teeth. Space maintenance is especially important after premature loss of primary teeth to prevent drifting and maintain the dental arch width and shape until permanent teeth erupt. Removable and fixed space maintainers are commonly used depending on factors like patient cooperation and eruption status of permanent teeth.