Having retired from being a dental assistant, I knew what to look for in this product. And it was all positive! It did not come with trays, which can be expensive if you don't already have a set (I did). But I found the process of filling the trays easy. All that is needed is a steady and controlled hand. When placing the tray into the mouth, I found using a Q-tip to remove the excess along the gum line worked fine. The solution is very strong so it is important to remove any extra or you will devintely have burning gums. I saw an immediate imporvement after 2 sessions of 1/2 hour each. I don't remember the directions saying anything about not eating or drinking anything for a while after using solution, but it's a good idea not to. Particularly coffee, tea or red wine. This product is definitely worth the money and it gives the results you're looking for.