Fig. 6: Non-destructive characterization.
From: Pyro-catalysis for tooth whitening via oral temperature fluctuation
Scanning electron micrographs of the same area of tooth enamel a before whitening, b after whitening with BTO gel, and c after further whitening with commercial peroxide gel. d The Vickers microhardness of five points on the enamel of the same tooth in different states (n = 3) and e the comparison of the average microhardness of the enamel in different states (n = 5). Scale bar: c are 100 μm (top) and 50 μm (bottom), d is 1 cm. The experiments in a–c were repeated independently for three times with similar results. Data are presented as mean values ± SD. Source data are provided as a Source Data file.
