الفهرس 
AcknowledgmentOnly 14 pages are availabe for public view
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Abstract
The aim of this study was to evaluate the change in color and surface topography of enamel after bleaching with different bleaching regimens including chemically and light activating systems.
This study was carried out to:
1- Evaluate and compare between two different bleaching systems, one of them is a chemically activated bleaching gel of 38% hydrogen peroxide and the other system is a photo activated bleaching system of a 25% hydrogen peroxide gel.
2- Evaluate the effect of light on the outcome of stained tooth color.
Evaluate the effect of different bleaching systems on surface topography of enamel.