How to Use Opalescence Go Professional Teeth Whitening

Can I use both top and bottom at the same time

How often do I use the trays. Do I do it once a month or how many times???

can I use two at once?

Can I use the same tray two days in a row or is each tray meant to be used only once?

Can you be more informative in your videos? How long do you keep the 15% strength in?

How many days do you keep it in?

I got these from my dentist and didn't know how to use, and this helped. Thank you!