Composites don't dent. Never had a problem with a Miken bat (DD broke one, but they replaced it within 5 days - also has broken a couple of RTs though so...) as they generally are fairly durable. I would expect a higher incident of breaking with any "light" bat though, if used by a stronger girl, due to the fact that they are shaving the weight from somewhere, usually the handle, to make it lighter.