
You can even hold it between your lips if you want to. Probably not something you want to do in public.
I didn t see whether they just sold the syringes with the treatment, but you could probably find it elsewhere on its own. Because of the amount of treatments you can stretch this to (20) this is the BEST VALUE of all the systems I tested.
It also came with the re-mineralizer and LED light which as an extra bonus. If I had to choose ONE system this would be it as it has full control and comes with the most options /ability to whiten your teeth over a longer period.
I used this in conjunction with the other two above, and thus saw 2-3 shades of difference with 3 uses. The time periods to keep the product in also seemed inconsistent: I recommend you start with 20-30 minutes and only stretch it to an hour after you are more confident using the system.

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