What relaxation techniques can i do to help someone deal with bruxism?

There are an array: Of dental appliances that can help. Consult your dentist. Tm, i personally find to be useful to deal with the stresses of life that sadly we all seem to have an abundance of. Good luck.

Hard to prevent: Bruxism often occurs when someone is asleep. Stress often plays a major role as a factor. Being stressed, we often don't sleep as soundly as we could, and that is translated into grinding one's teeth as stress relief. In many situations, a night guard is indicated to protect the teeth. Consider having that fabricated first to prevent damage, and then work on minimizing the stress.