IRCT2013110215236N1 IRCT 2014-02-05 Laser Department, Dental School of Tehran University of Medical Sciences Treatment of gum disease Treatment of periodontitis and chronic periodontitis and the complications 2011-09-23 anticipated 44 Complete https://irct.ir/trial/14545 interventional Randomization: Randomized, Blinding: Double blinded, Placebo: Used, Assignment: Parallel, Purpose: Treatment. 0 (exploratory trials) Chronic periodontitis. Intervention 1: The patient will be under SRP (Scaling and Root planing) treatment after a clinical check-up and registering the below parameters: 1. Bleeding on probing (BOP) 2. Clinical attachment loss (CAL) 3. Plaque index (PI) 4. Full mouth plaque score (FMPS) 5. Full mouth bleeding score (FMBS) 6. Periodontal probing depth (PPD) In order to see that there is no dental plaque. The patients are to be checked-up in the 1st 3rd and 7th days one week after SRP every single gets radiated in 3 sessions over 3 days that every radiation is in the 1st 3rd 7th days over a week in this research. We randomly split the patients into 2 groups called beholder and goal. The goal group: The patients continuously go under photodynamic therapy with 810 nanometer Diode laser Having 300 mw power in 10 seconds and 3 joule energy in 6 adjacent dental points followed by EmuDo photosensitizer . Intervention 2: The beholder group: The patients go under SRP treatment with physiology serum and off laser. the approved patients are to be reviewed and compared in one three and six month intervals.