Hello,This is a very good question that I am happy to explain:For clarification, Invisalign doesn't attach with buttons. The buttons are called "attachments" (other companies call them engagers), but these are used to help move teeth that need more complex movements. Invisalign also trims their aligners at the gumline, which decreases their retention. The buttons or attachments help it stay in better.SmileCareClub have what is called a "straight-line trim". This rides about 2-3mm above the gumline and is actually more esthetic. You can't see the trim in photos because it's hidden under you lip. This, along with the absence of the attachments, makes the aligners totally invisible.SmileCareClub aligners are also worn for 3 weeks each which helps to compensate for the absence of the un-esthetic attachments. For most patients, having your aligners completely invisible is a great esthetic option. Also, there is nothing to break or stain so you can't eat whatever you want: candy, popcorn..etcBest of luck with your decision on which aligner to choose and please post photos!