Alterations of the enamel after topical application of bleaching
agents, presenting as major consequences are: ions release,
increased superficial roughness, stronger bacterial attachment
and hardness alteration.The aims of the study were to evalu
ate
the effect of the bleaching agent (35%hydrogen peroxide) for
vital teeth by using light source on the release of ions from the
enamel surface. our sample consisted of 30 sound enamel
surface for control group,30 sound enamel surface
for(35%hydrogen peroxide), and then application of light
radiation to activate the bleaching agent. Ion Chromatography
were used to measure the ions release .