So I got my first mouthgaurd about a month ago. The shockdoctor? Put it in hot water, molded it. The first few times it fit ok, but I left it in my gear bag for about a week without using it. Last night i put it in and it felt like the whole gaurd had shrunk. DIdn't fit at all. I still wore it but now my jaw's are aching. Anyone else have this experience?