How long does a treatment last
2011411
I use these for between dental cleaning maintenance. I wear one strip overnight about once every two to three weeks. I also use a sonicare toothbrush, so this helps to keep my teeth fairly white as well. I have never used them as directed, one strip from 2 hours to over night for five nights, so I can only tell you that they work very well for what I need. My teeth are noticeably whitened the morning after I wear them and it is the level of whitening that I am looking for. That being said, I don't think that you will regret trying them. I have tried the Cr*st whitening strips that are twice the price and they were not even close to the same quality as these. The strips are much thicker and immediately seem to bond to your teeth.
2011412
Depends on how much coffee and tea you drink anything that can stain your teeth. I use a straw to try to prolong it.
2011413
As long as you don't stain them again....cut back on coffee, tea, etc. to prolong the effects.
1301164
About two months, like it says. The face wash lasts a little longer, the clearing toner a little shorter.
394647
It depends on a couple things. How much product did you apply? One sheet, two sheets. Obviously the more u apply the longer it lasts. It is also important to keep your skin moisturized and exfoliated. 7-10 days is what you'll get. Its worth it.
562399
It lasts about a week. But it depends on how many showers you take and how hard you scrub :P
1973931
I was told by my dentist that each of these syringes will last 7 days. You put a dot of the whitening solution in the middle of each tooth impression on the front of your trays. It will spread out when you put your trays on.
450846
I use this system and it tends to last about 4 weeks. That's with light use, twice daily. Be light handed with the serum though, a little goes a long way.
527525
As with any medication, the expiration date is at least 6 months before the medication's effectiveness starts to decline. If you have concerns you might consider donating what you can't use to a local animal shelter or rescue. Doses are based on animal's weight and need to be repeated, depending, every 3 to 4 weeks initially.
1774415
It's the same as on medications. That is when they expire. Due to it is medicated.
1836205
Depending on the person, generally between 30 minutes and two hours (some traces of the effect sometimes last close to that two hour mark) I generally have it work perfectly for the first 30-45 minutes then it trails off by the one hour mark, though some of my friends have said it lasted longer for them.
1967926
I do NOT immediately, you should see improvement over time. As to your other question, I keep the solution in my mouth from 5 to 15 minutes other reviewers have claimed longer 30 minutes. I hope this but it really comes down to you and what you prefer!
391100
I use the treatment packet about once a week or so and on the blonde ones it says to only leave in for up to 5 min. I've not left them in longer but I also use their other treatment packet which is good for removing minerals from well water and you can leave that one in for as long as 30 min. I love them both they work so well to take the orange/brass color out of my light blonde hair from our well water.
812651
It's recommended to use for 5-10 minutes for each treatment; but I've found it'll retain heat for about 20 minutes if applied immediately. (Your body helps it retain some heat)
1021763
This is an actual treatment, that takes about 2 hours to complete on my shoulder length hair, and last about 2-3 months. You definitely need someone to help you with it, it's not a one person job.
1669553
All cosmetics have a indication of how long they will last after opening. This is indicated inside a small icon of an open bottle with a number next to an 'M' (for months). Most shave creams usually state 12M, or a year after opening.
1737720
That's hard to say exactly. If you use a couple of drops each time (like it recommends) it should last for months, or longer.
2265837
It usually takes about 15-20 minutes to effect. And then it's effect lasts for an hour.
1768038
my experience has been one hour minimum and up to 3 hours or so. It loses effectiveness after about 3 hours anyway per their instructions.