Cali White Teeth Whitening Kit with LED Light

It comes with enough gel for 10 treatment days. I'm on my 6th day. I skipped one because I was really tired.There were noticeable results after the first use. The gel sticks really well to the side of the retainer. I had slight irritation on my gums during one treatment, but was fine on the others. The first time I did it, I didn't pull my lips out around the retainer. I think this caused the gel to really sit on my gums causing irritation. The lack of a seal also caused a ridiculous amount of drooling.You're supposed to brush, floss, and dry your teeth first. Do your treatment. The light has an auto-timer of 10 minutes. You can leave it in for up to 30 minutes. I did 10 minutes for the first 4 treatments, and 20 minutes for the last two. Then you rinse with warm water, and brush again.I'm not sure if it's officially waterproof, but I did do one treatment while I took my shower (multitasking!) with no issues.They suggest you do it at night. It says your teeth will be more suseptible to staining for the first 2-3 hours after treatment while your teeth remineralize. Doing it before bed protects them from staining. (So don't do it for a quick whitening, then go on a coffee date. It will defeat the purpose. )My dentist prescribed me a remineralizing toothpaste to be used at night before bed. I use it after my treatment, and make sure I don't eat or drink anything except water until morning. I might be concerned about mineral loss in my teeth if I didn't have the special toothpaste.