This study will retrospectively evaluate the outcomes of scaling and root planing over a two year time period. The study will focus specifically on the effectiveness of SRP in pockets with an initial pre-treatment pocket probing depth of ≥ 5 mm and ≤ 8 mm. The study will also examine the response to SRP of all initial pocket depths, i.e., those PPD that fall below or above those in the indicated range, to verify the findings of previous studies.

Inclusion criteria:

• All patients treated by dental students who have the required data
• 14 or more permanent teeth
• Have at least 2 molars (excluding third molars)

Exclusion Criteria:

• All third molars and second molars next to a partially impacted third molar
• Smokers
• Diabetes
• Immunocompromised patients (HIV/AIDS; chemotherapy; systemic steroid therapy, etc.)
• Pregnancy during treatment or during the follow-up periods
• Diagnosis of Alzheimer's or dementia
• Diagnosis of oral mucous membrane disease (BMMP, Lupus, erosive lichen planus, etc.)
• Patients that have received periodontal surgery following SRP

Patients treated by dental students at TAMU Collage of Dentistry Predoctoral Clinic