I just got my invislign yesterday. Yes they are clear and not noticable but they do HURT! I dont think they hurt as much as metal braces (although I've never had metal braces). As long as you keep them in they feel ok but as soon as I take them out to eat and put them back in afterward the pain starts all over. My mouth is full of spit and I have small lisp. But if my teeth are going to end up looking like the computer picture my doctor showed me....then it will be all worth it! One day down....364 to go!