All it really does is provide a slightly faster onset. So if you're say, feeling really anxious and want immediate relief, them chewing benzos or putting them under your tongue can help them to come on sooner. When I've taken benzos for dental work the dentist would crush the pill, put it in a bit of water, have me swish it around in my mouth and then swallow in order to get the effects to come on sooner. I've also tried dissolving the pill under my tongue. I don't think either really made a huge difference though.