This mouth guard works great! It stays in my mouth the whole time training and when I’m sparring and the protection really good and I also crooked teeth so I have to mold it really good but I did take me a few try’s to get the good mold for my teeth sometimes it feel loose also kinda big in my mouth but I can still talk and breath but it’s protection is good but I have another mouth guard I prefer this mouth guard so Thanks TK Boxing!!