cleans well, soft, maybe too flexible. i like itSo far I like these. Maybe not for everyone because they are very soft. I've been looking for something this soft for a long time.I've been looking for a toothbrush with long bristles and I'm glad I found this brand. I also love that it has so many bristles, unlike the regular toothbrush you usually buy from grocery stores. I mainly use this for cleaning my Invisalign retainers. Please make one with longer bristles so it'll reach all the nook and crannies of my retainers and I will definitely buy one of those.These toothbrushes are the best. It's like polishing your teeth rather than brushing. They don't irritate, and they do a great job. I am a convert.Brush only lasted 6 weeks.My gums feel much better after brushing with this. It has done a wonderful job on my teeth and my mouth is not so sensitive after brushing.5 stars!While I prefer a brush with a little more medium power, this is a fine brush for those that need something soft and gentle. It's a low-build brush that's wonderfully bendy with soft yet scrubby bristles.- Made in China- Each has its own dust cover (not a full travel cover)- Very light weightThey're made of... I don't know, they don't bother to say. Something extremely light. Has a 1.5" silicone grip wrap at the appropriate place. Both had sharp ends where they're cut from the mold hanger but a few swipes of a coarse nail file fixed it fine.The tongue scraper on the back of the head is very shallow and, being silicone, doesn't have much oomph to it. Doesn't do a thing for me but it doesn't bother me, either.My eyes about rolled up in my head trying to read the massive hype, not to mention how very many times they had to say "nano toothbrush". Anyway, sorting through it all, it is indeed a rather compact head. Contrary to what my husband says, I have a small mouth and it can be a little difficult to find compact heads.As far as the exaggerated conditions this helps, sure, it could, along with every other toothbrush made, ever. The bristles really are very fine so they are noticeably softer. That may feel good but also may not be what you need to get your teeth really clean. They are, however, tightly packed in so there's still some good coverage.Depending on which type of braces you have, these won't be good for that. They'll get stuck and wear out in no time.There is no contour to the head or bristles. I love that about my Sonicare brushes, they fit on exactly 2 teeth at a time.I have to make mention of quality control issues. I took a couple of pix. Sloppiness may not be that big of a deal but it speaks to the entire manufacturing and approval process. If you see sloppiness, what sloppiness are you not seeing? Up to you, though, what matters to you.I like it over all. My husband does have extremely sensitive gums, even since he was a kid, so he's sticking with this. I'm too in love with my Sonicare so I just have to hope they'll someday make their brushes a little more eco-friendly.With the too-exaggerated claims, the tiring overhype to sort through, and the quality control issues, I think 4 stars probably works. I kinda want to go 3, just because I'm so sick of the overhype, but that's not really about the product so 4 it is.Remember to price check - this is a foreign AliBaba-type reseller and they tend to have a dozen or more people selling the same thing.Don't forget to use the Smile.Amazon.com address - It's an Amazon program where many everyday things you buy will generate a small donation from Amazon to the charity of your choice at no cost to you. Info here: https://smile.amazon.com/gp/chpf/about/ref=smi_se_rspo_laas_aas