The Preventive Dentistry Module - PDM - is being offered as an advanced level of training for dental assistants who have been licensed as a Level II dental assistant for a minimum of five years, who are currently licensed to practice as a Level II dental assistant within the province of New Brunswick and are currently employed as a Level II dental assistant within the province of New Brunswick. The PDM module will be offered in two phases, both phases of this module will build upon the dental assistant's existing knowledge and skills through home study which will provide the knowledge required to complete 2 theoretical examinations. Successful completion of the first theoretical exam is required prior to entrance into PHASE II, and successful completion of the 2nd theoretical exam is required prior to entrance into the clinical component of PHASE II. The clinical component of each phase will include instruction, practice and evaluation of all required clinical competencies. PHASE I of the PDM module will provide dental assistants with the knowledge and skills required to complete patient oral assessments. This will provide the dental assistant with the ability to assess whether or not the patient's needs are within the dental assistant's scope of practice. PHASE II of the PDM module will provide dental assistants with the necessary clinical competence to perform periodontal scaling on patients who have: a.Healthy gingival and periodontal tissues b.Plaque associated gingivitis c.Pockets that are four (4) mm or less