The strips do not go all the way from side to side it covers only about 2.5-3 inches of your front teeth so even if it worked you would have nice white teeth on the front and still yellowish on the back

So, If they worked, the teeth would only be white in the front.

I have very sensitive gums and teeth, tried several different brands before

I’m 62 not a smoker drink at least one cup of tea a day I’ve used a whole box of strips and my teeth looks just a little bit cleaner than before but not white as I had hoped for

I don’t use these everyday because i do have sensitive teeth

Your teeth will hurt from sensitivity after each use

I have sensitive teeth and for once these strips did not cause that

and if you have sensitive teeth, be careful