I bought a 42 pack of the whitening strips after multiple influencers recommended them. I used the first set and was surprised by several parts of the experience. Here are a few of my observations. The strips don’t slip around on your teeth during wear. I liked that you only have to wear them for 30 minutes. Removing the strips with my fingers proved difficult. I ended up using a paper towel with some grit to slide them off. The strips left an extremely thick Vaseline-line gel on my teeth afterward, and it’s one of those things that you can’t spit out. I have had to brush my teeth several times after use with an electric toothbrush to ensure the gel is gone. The gel does not have any taste, and I know it’s made of all natural substances, which is good, I guess. I was shocked by how white my teeth were after the first use. Shocked. So much so that I called my mom and told her to buy them. She did. What I didn’t realize, was that that initial white fades after about 30 minutes and your teeth go back to normal. I followed all of the directions on the box, and did 1 week of the strips daily. My teeth felt whiter. However, after going about 4 days without using them, my teeth looked dull again (back to square one) and I had to start from scratch. So, all that being said, I was pretty disappointed with this product. My mom feels the same. I still have a bunch of strips left and I just purchased the old crest white strips again, even though I get major sensitivity with them. If you’re someone who absolutely cannot tolerate the crest white strips, you could try these, but I’d recommend getting them on sale in case you don’t like them.