How many trays are included in the Teeth Whitening Trays by BURST? July 12, 2022 17:23 Updated Each box includes 14 trays (7 upper and 7 lower) for 7 treatments total. Enough for a full-week course. Related articles Are the prefilled Teeth Whitening Trays by BURST safe for enamel? Why should I choose the Teeth Whitening Trays by BURST instead of the Whitening Strips by BURST Can I use the Teeth Whitening Trays by BURST for 14 days in a row? How long will my results from the Teeth Whitening Trays by BURST last? Should I apply the Teeth Whitening Trays by BURST before or after I brush?