AuraglowTeeth Whitening Gel, 35% Carbamide Peroxide, 3 Gel Syringes, 30 Treatments

Could i use this in an invisalign tray?

Do you have to have to use it with the light?

Do I need to buy the light for this to work?

Will this gel whiten fillings? I have a couple on the front of my teeth, but unsure if it will whiten along with the teeth.