the aim of this clinical trial is to compare the new micro-abrasion material "ANTIVET" compared to the conventional micro-abrasion material used widely "opalustre". to achieve better esthetics in cases of hypo-mineralized anterior permanent teeth of children and young adults. both materials will be applied by the researchers and patient's teeth sensitivity and color change will be assessed immediately , after one month and after three months
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postoperative changes in teeth sensitivity
Timeframe: change from baseline teeth sensitivity immediately after treatment ,change from baseline teeth sensitivity after one month from treatment and change from baseline teeth sensitivity after three month from treatment after
patient satisfaction
Timeframe: after 3 months