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I would assume this means she has a Class II molar relationship, and that perhaps either her upper front teeth stick out farther ahead of the lower incisors, or they tilt in backwards to meet them? She has, I am guessing, what is referred to in the common parlance as an overbite. It's also possible that some of the other orthodontists are considering headgear instead.
My advice is to ask each ortho why. So to the pendulum doc, ask why not rubber bands or headgear. To the rubber bands doc, why he does not think that a pendulum is necessary. And so on. And ask each of them questions such as how stable the expect the results to be, and how good they will be aesthetically.
At the end of the day though, it sometimes just boils down to different ways to get to the same, or at least a very similar, end point. The main difference between the pendulum, and headgear vs. rubber bands is that the rubber bands will tend to move the lower teeth forward at the same time as they move the upper teeth back, whereas the pendulum or headgear would be acting on the upper teeth only.
Of course, one advantage of something like the pendulum is that it does not rely on your daughter using it as instructed, as usually it would be bonded in place. The flip side to that coin though is that it could be seen as more "invasive" than simple rubber bands - it has metal bands that attach to the teeth, and an acrylic plate that rests against the roof of the mouth. Sounds like a lot to get used to, but most people manage well, even after only a few days.
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