Prevalence of Periodontitis Based Upon Principles Presented by the 2017 Classification: A Hospital-based Cross-sectional Study on a Sample of Young Egyptian Dental Patients

Inclusion Criteria: 1. Patients whose age from 12 to 39 years old . 2. Patient consulting in the outpatient clinic 3. Provide informed consent. Exclusion Criteria: 1. Patients having problem in opening their mouth or undergoing inter maxillary fixation where oral examination will not be possible. 2. Patients diagnosed with psychiatric problems or intoxicated with alcohol or drugs