I believe there are mouth guards that you can buy either online or at a brick and mortar store I'm not sure....that are filled with water. (Actually I think I got mine at Walmart now that I think about it.) You ear it at night and that prevents tooth grinding and clenching teeth.

I bought one once to prevent my teeth clenching, but I found it a little uncomfortable since my mouth is so small. They are somewhat customizable, and much cheaper than a dentist's customized version.

There are also regular day/night mouth guards. Just do a search online and you should come up with something. None of these should be over 20 bucks.

bruxism mouth guard are hard ones and are custom made you should invest in this because it would be costly but you will save a lot of money because with time bruxism patients end in costly restorative treatments so buy it and you will save money and it will protect your teeth and muscles