Photodynamic therapy at 810nm, associated with ozonated water, may concurrently prevent periodontitis exacerbation and restore dental health.

• Ozonated water at 0.5–4.0 mg/L is able to reduce periodontitis impact. • Photodynamic therapy at 810 nm is able to reduce periodontitis impact. • Ozone and photodynamic therapy concur in inhibiting periodontitis impact. • No statistical difference we reported between ozone and PDT. [ABSTRACT FROM AUTHOR]