Yes, they do. I got the Crest strips and only used a few and definitely noticed a difference.
They make your teeth hurt when they're on, kind of a stinging ache, especially for the first few minutes. Afaik, this is normal. Be sure to follow the directions. One of the side benefits is they also strip away some of the tartar.
Savings tip: You can almost always find a coupon for them. There's the cheap Crest strips and the expensive Crest strips (IIRC, they were $15 vs. $30). You can often find a $10 coupon for the expensive ones and a $5 one for the cheap ones, but if you go to Target and buy the cheap ones, the expensive coupon will work, so you can get them for like $5. (My $ amounts are not exact.)
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They make your teeth hurt when they're on, kind of a stinging ache, especially for the first few minutes. Afaik, this is normal. Be sure to follow the directions. One of the side benefits is they also strip away some of the tartar.
Savings tip: You can almost always find a coupon for them. There's the cheap Crest strips and the expensive Crest strips (IIRC, they were $15 vs. $30). You can often find a $10 coupon for the expensive ones and a $5 one for the cheap ones, but if you go to Target and buy the cheap ones, the expensive coupon will work, so you can get them for like $5. (My $ amounts are not exact.)