Enhanced Long‐Term Color Stability of Teeth Treated with Hydrogen Peroxide and Non‐Thermal Atmospheric Pressure Plasma Jets

To evaluate the color stability of teeth bleached by non‐thermal atmospheric pressure plasma with 15% hydrogen peroxide (HP) or carbamide peroxide (CP), extracted human teeth were assigned to four groups ( n  = 10) and treated with (1) plasma with 15% HP; (2) 15% HP alone; (3) plasma with 15% CP gel; or (4) 15% CP alone. Tooth color was assessed using the CIELAB system over 6 months. Hydroxyl radical concentration ( • OH) was determined using methylene blue dye. Statistical analyses were performed with Student's t ‐test, one‐way ANOVA, and post‐hoc Duncan tests ( p  = 0.05). Groups 1 and 3 showed higher color stability than Groups 2 and 4 throughout 6 months. The • OH activity in plasma with HP/CP was greater than that in HP/CP alone. Thus, we recommend plasma application for bleaching as it provides better color stability.