Periodontal disease, prevalent in 20% to 50% of the population, is a chronic multifactorial inflammation caused by a dysbiotic oral biofilm, with gingivitis and periodontitis being the most common forms. Flavonoids, such as myricetin and catechin, have antioxidant and anti-inflammatory potential, reducing nitric oxide (NO) and reactive oxygen species (ROS) in lipopolysaccharide (LPS)-stimulated macrophages. This study compared the effects of different flavonoids on viability and oxidative response of LPS-stimulated macrophages. RAW 264.7 macrophages were cultured at a density of 1-5 × 10