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Answer:
This procedure is called chairside bleaching and usually requires only one office visit. The dentist will apply either a protective gel to your gums or a rubber shield to protect your gums. Bleach is then applied to the teeth.
Explanation:
<span>While new cases have been reported in all regions of the world, approximately two-thirds are in sub-Saharan Africa, with 46% of new cases in Eastern and Southern Africa( hope i'm right)</span>
.60 x .40 = .24 so the patient has a 24% chance of surviving the surgery and the damage healing