Each Gel syringe includes enough for 2 treatments.
You will notice measurements outlining how much Gel to use on the side of each syringe. Simply squeeze out and apply 1/4 of the Gel to one side of the mouth tray and 1/4 of the Gel to the other side of the mouth tray, using 1/2 Gel syringe per treatment. If you find this is too much, you can reduce the amount to suit you.
You should repeat a treatment for the first 6 nights and then just once every 2 weeks afterwards.