I grind very badly at night and this is the ONLY night guard that is comfortable and holds up well. I usually end up destroying guards in a couple months, these have continued to hold up well and they are so thin and comfortable!
Pros: custom fit, easy to use, easy to form, can be re-formed, inexpensive, secure on teeth
Cons: Shrinks when it hardens squeezing the teeth and making the right fit hard to gauge, EXTREMELY long shipping wait, took over a month to arrive.
You can pretty much only mold the mouth guard once, not over and over again. My first try worked ok, but wasn't fitting just right, so I put it back in hot water to flatten it. That worked, but I wasn't able to successfully re-mold it again. I threw it away. :(
I grind my teeth pretty badly at night - my dentist warned me I would end up looking like General Norman Schwarzkopf (sp?) if I didn't get a night guard. Since then, I've tried a bunch of different ones and I've never been too happy with any of them... until now. The SISU Sova is absolutely PERFECT. Fitted to my teeth - not just on the top, but also on the bottom. The plastic is super-thin, so it's not propping my mouth open. And the tiny holes in the plastic keeps it from over-suctioning to my teeth and gums, which can be exceedingly unpleasant or even painful. SO. Best Nightguard ever. I can't believe I got it for $10. You can bet I'll be buying a bunch next time they come around!