Actually, as a stylist, I use these a lot when I do up-do's on clients; I've never had a problem with clients with thin hair and covering the teeth...I suppose if you are trying to get it perfect yourself it would be a bit difficult, but since I put it into the clients hair I'm able to manipulate the hair around the bump. Personally I have normal hair; not thick and not thin. I have no problem with putting them in myself.