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Table 1 Test groups

From: Does post-bleaching fluoridation affect the further demineralization of bleached enamel? An in vitro study

Groups N Bleaching agent Fluoride application pH F application time
1 10 No agent ---------   ---------
2 10 38% HP --------   --------
3 10 38% HP 2.1% NaF ~1.2 1 minutes
4 10 38% HP 1.5% TiF4 ~1.2 1 minutes