Anyone have experience with them? Iím thinking of getting one just because I seem to love chewing stuff. I havenít really looked at them much though, so Iím wondering what you think I should look for in one. What are the odds of finding something that will really fit an adult mouth well? A lot of them seem to be filled with gel, so I was also wondering just how tough those are, because I certainly donít want to bite through and have that gunk getting all over the place (I chewed a few holes right through my favorite pacifier). So any advice on these?