Evaluation of teeth whitening with application of novel toothpaste containing ozone

Background and aim: the aim of this study was to evaluate the effectiveness of different whitening toothpastes,focusing on the experimental ozonated toothpaste.methods: this laboratory study included a sample of 48 sound human molar teeth. teeth were randomly assigned intofour groups according to toothpaste treatment to be evaluated objectively (colorimetric method) and subjectively (visualassessment) (n = 12). group i: ozonated toothpaste (experimental); group ii: non-ozonated toothpaste (experimental);group iii: aqua fresh whitening triple protection; and group iv: nasim (toothpaste without a chemical whiteningagent). after tea staining and color assessment, the teeth were subjected to a tooth brushing regime as for 6 weeks, donetwice a day, 2 min each time (total: 168 min). next, color changes were determined after brushing by instrumental andvisual methods.results: analysis of variance and the tukey tests were used for evaluating statistical data (? = 0.05). color change byinstrumental index showed that ozonated and aquafresh toothpastes increased teeth whitening; however, the amountcolor change was not significant (p > 0.050). with visual assessment there was a significant difference between meancolor change among the four groups (p = 0.008).conclusion: ozonated toothpaste caused significant whitening changes in discolored teeth from a clinical point ofview by visual assessment.