Is there a way to fix bruxism without a mouth piece?

No: No a night guard protect the teeth . But if you are a bruxer the you just need to protect your teeth.

Don't think so: I have been in lectures where the top in the field have said even if someone's bite is perfect, if they want to bruxe they will. Maybe vote for a different party in the next election (bad joke).

Doubtful: A mouthpiece is one piece of the puzzle as far as treating bruxism, but attempting to get to the source of the bruxism should be the number one priority. People grinding/clench their teeth for many reasons. A thorough history and exam are imperative.

Yes: Yes. Mouthguard traditional method. Botox injections to jaw muscles very effective. The oral meds that are effective are habituating. See TMJ-orofacial pain doc for guidance.

Speak with DDS: Discuss all treatment with your dentist. Do you also have TMJ involvement? Bruxism can be treated by various methods, speak with your dentist to find what works for you. The dentist may advise an orthodontic consultation if the bite is off and bruxism is a by-product.

Night Bruxism: also called night time clenching, may cause pain in the temple area, tooth wear, teeth movement and even damage or break teeth. Currently, no therapy has been proven effective in treating sleep bruxism. See your dentist for night guard fabrication for teeth protection. Good luck.