i use these almost everyday, and leave it on for the full 30 minutes, but if you have sensitive teeth i would not recommend using it everyday. i have noticed a huge difference in how white my teeth have gotten. i will definitely repurchase.

I use a full treatment box of these white strips, twice a year. They are absolutely amazing, and they stay in place until you take them off. By far my favorite of all the crest strips.

Would not recommend. The product squished out the sides and tastes like mushy peroxide. It left my teeth feeling very sensitive. I didn't notice any difference in the color of my teeth.

it's not what you were thinking it doesn't really white in it very much. You need to use at least a few strips A few different days in order for it to work as well it's hard to get it to stick on your teeth

I purchased the crest 3D whitestrips reluctantly, taking a chance,but the results blew me away I saw a difference in about a week or so. I continue to buy this product being a great investment!

Love these so much! They work wonders but it's a little pricey and i've tried cheaper brands and they work just as well but the crest ones are definitely worth the extra money. So just go with what you prefer spending.

Keeps my teeth white without breaking the bank. Pop them on during my shower and take them off when I get out. I usually whiten once a week because every day makes my teeth and gums too sensitive. Currently using.

these are GREAT! i was already seeing big differences after like one use! my teeth are very sensitive and i can't use them often without my teeth hurting, but i use them occasionally and my teeth don't hurt and they're looking a lot whiter already!

these work really well, i used to hate doing these as a kid, but they must have changed the taste of the product because it's bearable and it truly whitens my teeth. i would 100% buy again and recommend everyone to buy this product.

I use this pretty often! I could tell a difference after my first use. They really do work or I would not waste my time or money on this product. Your teeth can become a little sensitive, but will subside.