I started my second set of trays 3 weeks ago tomorrow, and I receive my third set tomorrow. The lisp has gotten much better. I have felt no pain with the second set, and I have seen some movement in my teeth. I have not done all that well with my second set in terms of wearing them frequently, but I typically wear them at least 14 hours a day.
When I got my first set I was making the sucking noise a lot and didn't think people could hear it until finally a few people asked me to stop. I drink a lot of water, so on my last sip I pull the water through the trays to flush it out (similar to if your rinsing with mouth wash and you want to pull it through your teeth) You leave the liners in while doing this and it helps clear the saliva out!
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