239.All are true for home bleaching,except

a.Uses 15%carbamide peroxide
b.In addition to bleaching agent carbapol is used
c.Vacuum from vinyl trays are used
d.Both arches bleached simultaneously


Ans-d.Both arches bleached simultaneously

Explanation-sturdvent 4th ed pg 610-612
It is recommended that only one arch be bleached at a time, beginning with maxillary arch.bleaching the maxillary arch first allows theuntreated mandibular arch to serve as a comparison.

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