الفهرس 
AcknowledgementOnly 14 pages are availabe for public view
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Abstract
This clinical study was carried out to investigate and evaluate the effect of using a titanium dioxide photocatalyst in conjunction with different concentrations of hydrogen peroxide bleaching gels, together with two application regimens and the use of a post-operative remineralizing agent on:
1. color change.
2. tooth sensitivity.
3. surface roughness of enamel.