The duration of its use is 30 minutes
For 10 days or when needed

Tooth sensitivity and gum discomfortWith all bleaching products, you may experience tooth sensitivity or an unpleasant feeling in the gums. These symptoms are generally mild. These symptoms are temporary and not harmful. If the sensitivity of the teeth increases or the gums are disturbed, discontinue use for 2-3 days, and then continue the use. If the problem persists, discontinue use.