Hello Interloper!
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Any brace system works on the simple fact that if you put a force on a tooth, then the position of that tooth will move, (simple, right?). I would also forgive you for thinking that the harder the force, the quicker things will move, but this is the exact opposite of what happens, in fact putting too much pressure on the tooth can slow it down, and even cause some permanent damage to the tooth. The reason for this is that too much pressure kills the bone around the tooth!
So now, I hope you thinking: “If the new braces like six-month smiles don’t put too much pressure on the teeth, then how do they achieve quicker results?”
The answer to this is that it's all just clever marketing - all systems which have a bracket and wire system will move teeth at pretty much the same rate, the difference is in what is done in terms of the treatment.
If you do less treatment, then the results will be quicker!
With almost all adult focussed systems (also known as STO: Short Term Orthodontics), like the ones mentioned above, the aim is to just straighten the front teeth - and hardly change the back teeth, and the bite.
This is fine, in most cases, and even if you had a comprehensive brace treatment, this would be the first thing which is done.