This is a primary course textbook providing a comprehensive and easy-to-understand presentation of periodontics for dental hygiene students. The text focuses on the hygienist's role in periodontal therapy and makes effective use of an instructional design that facilitates teaching and learning the material without watering it down. Rather than traditional narrative, the author uses a detailed outline format to present content, making the information easier to read, understand, and reference. The author also integrates an evidence-based approach, which is increasingly important in the field of dental hygiene.