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Summary form only given. Eating habits, smoking, drugs and chemicals can cause undesirable staining of teeth. Tooth whitening has become a popular dental practice to remove stains from the tooth surface for aesthetic or therapeutic purposes. Traditional in-office tooth whitening involves applying dental gel (active compound: H2O2) on patients teeth for several 15-20 minutes intervals. However, studies have shown that prolonged use of clinical teeth-whitening gel (with concentration of H2O2 up to 30-40%) can be harmful. In this work, we present tooth-whitening results of extracted teeth treated by a direct-current, cold, atmospheric-pressure air plasma micro-jet (PMJ). Dental gels (Beyond Technology Corporation, USA) with different concentrations (6%, 15%, 25%, 35%) of H2O2 are applied to teeth during the treatments. A considerable improvement of the whitening effect was observed when dental gel with lower (such as: 6% and 15%) concentration of H2O2 was applied. The improved whitening is attributed to the effective production of reactive oxygen species (ROS) such as atomic oxygen (O), hydroxyl radical (OH) and singlet molecular oxygen (1O2). The surface temperature of the tooth during the plasma treatment was monitored and found to remain below 40°C. Modification of tooth surface was detected through a scanning electron microscope (SEM), X-ray microanalysis (SEM/EDS) and microhardness test. This novel tooth-whitening approach, especially the improved whitening effect with lower concentration of H2O2 in dental gel, might revolutionize clinical tooth whitening process.