( F = 2.259; P > 0.05) (Table 2 ). Microhardness Table 3 shows the mean microhardness scores between groups at baseline (before brushing) and at 1 month and 3 months after brushing. In group 1 (perlite), microhardness values showed a decreasing trend from 70.72 at baseline to 57.28 at 1 month and 53.35 at 3 months, and this reduction in microhardness was found to be statistically significant.
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Effect of whitening toothpastes on the surface roughness and microhardness of human teeth-an in vitro study.
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