I have used this for martial arts sparing and the hole in the center makes it easy for breathing with the mouth piece in. It protects upper and lower well. 5 stars

I lost my last mouthpiece. It was a single layer, and I have seen a lot of people with double layers, so I went out and bought both a Century single layer, and this Everlast double (only double in the store).

Let me tell you, this thing is terrible. I spent around an hour trying to shape this thing, but it's just impossible. The distance between the front row and the back (where your teeth go) is wayyy too big. There's no way to form to both sides of your teeth... unless you have molars for your front teeth. This makes it impossible to make a solid fit, so unless you're always chomping down on it, it's going to fall out during sparring.

And yes, I did push with my tongue during forming (tried numerous times), but it's just too wide.

If that wasn't bad enough, there's not enough plastic to run all the way to your gums. This also means this thing is going to fall out the second you stop biting down. It also means it's poor protection.

The only thing they did right was the hole where you're suppose to breath through. Seems adequate.

So to wrap it up, this piece of junk is completely useless. Even if your mouth is small, this still wont work because there's no way to get it form to both side of your teeth.

At least I have that Century single layer one. That works fine. 1 star

I bought this thinking I could cut it down and that it would fit my 6 year old son. It does not fit even with cutting it like the instructions say. You're going to have to look for a specific "childrens" mouth guard. I'm looking into the Shock Doctor line of guards. 1 star

It is made for a small mouth (or maybe my husband just has a big mouth)as far as the area around the teeth but you would need a wide mouth for the area between the teeth. I hope that isn't too confusing. It just didn't fit very well or comfortably but others may find it suitable. 3 stars

do you know teeth are very important, what would happen if they got knocked out......well i for one don't want to find out so i bought this little mouthpiece, and i must say it doing it's job quite well!!! 5 stars