The goal of this clinical trial is to evaluate the effectiveness of periodontal treatment associated with the use of a tongue scraper, compared with the same treatment combined with antimicrobial photodynamic therapy (aPDT), in reducing halitosis in individuals with periodontal disease and type 2 diabetes mellitus. The main question it aims to answer is: aPDT treatment is more effective in treating halitosis? aPDT treatment is more effective in periodontitis? Researchers will compare aPDT treatment to conventional treatment (scaling and root planning and tongue scraper) to see if aPDT has additional effects in reducing halitosis and improving periodontal health.

• Participants will be asked to visit the clinic once a week for exam and treatment during 1 month.
• After active treatment they will be asked to come to maintenance and control visits once a month until 6 months.

Inclusion Criteria:

• Patients diagnosed with type 2 diabetes mellitus according to the 2019 WHO criteria
• Stage 3 or 4 periodontitis
• No periodontal treatment in the previous 12 months
• a minimum of 20 remaining teeth.

Exclusion Criteria:

• Smokers
• Alcohol-dependent individuals
• Pregnant or lactating women
• Patients with renal disorders
• Patients using medications that affect the periodontium

Simulation of laser treatment