In this Yulitle video: http://www.youtube.com/yulitle#p/u/23/XICQOhCb6VI He mentioned (around 1:25 - 1:40) that you want to clamp "just under the top of the teeth." Not all the way down and not at the tips. Why is this? I base this on nothing really, but it /seems/ to me that further down would hold better. My clamps seems to hold better further down anyway, but perhaps it is because they aren't as good quality as others. In any case, what is his reasoning for saying this?