How often are you supposed to use this product and for how long ( i.e, every night for two weeks??)
1966020
use as long as it takes to whiten, or until you are happy with the whiteness. I leave on for an hour.
1966021
Use every night for 1-2hours, in 1-2 weeks you will be able to know the difference on your teeth. Then you can just use once a month just to maintain the whiteness.
1261467
Hello..thank you for contacting..it depends from the depth of your lines..I would apply it twice a day..so as to have better results but prevention too..if you cannot just apply it every night!! It will work too
1165525
You should use it once a day for about 20-30 minutes over a period of about 2 weeks and you should see good results.
1744258
If you use it twice a day as it says on the bottle it will last 3 weeks to a month. If you are a slacker like me, it will last two months.
1905627
I use it at night. After I've washed my face and before I put on my moisturizer.
1994437
I've been using this for about 2 1/2 weeks. I just thought I'd try it. Supposed to apply nightly for 6 weeks before you see intended results.
985495
I think they recommend once a month. It depends on how frequently you use it.
1799179
I don't use it at night. It's for daytime. I don't know any reason why you couldn't use it overnight. But they make a night formula. I use THAT one at night.
1937417
This totally depends on your usage of the product, I used mine two weeks before I had to change mine, however, I only used this about 3-4 hrs a day.
978591
I used some I bought from a big box store. Took two in morning and two at night. I didn't see any change, but I only used it about two weeks, then ran out. I think maybe my trial wasn't long enough or it is hype. Not sure which. Sorry.
590104
You use it every night on a clean face. You can put a moisturizer over it .
1683401
Same answer here, as Leigh, depends on your skin. Try it and see how it works for you if you use it twice a day. I love it, but use it only once a night...
209875
I only use the serum at night sparingly so I try and make it last 6-8 weeks!
487853
It has worked a little. I think you need to give it time and not expect results quickly. I did buy another one when I ran out. You should use it nightly for best results.
1359704
I use it overnight on the 30 seconds on and 30 seconds off cycle. I can go 2 nights before having to refill.
1565075
I use it every other day and it last about a week and a half. I like it to look even darker so I might use a little more. :)
2006338
it depends on how much you use it. When i used it my son was up twice or more a night and it would run for 15 to 20 min each time. So it lasted a couple of weeks.