I think my oldest has some of the thickest, strongest roots holding her teeth in. Tonight, she's dealing with a tooth so loose it's just dangling. She can't sleep, can't eat, ect. She's up trying her hardest to twist this thing out. She's not a fan of string, or daddy trying to get it out, ect. (Last time she had one this loose, her daddy promised he'd knock it right out- some pain, a lot of blood, and a thousand apologies later- the tooth still hung. It lasted another week! Dangling by one root! Ugh!