Teeth Grinding (Bruxism)

I have this sickness Bruxism - Teeth grinding since I was young.
I tried to find some information for the treatment but there is no very good treatment for Bruxism.
Most of the information said that Bruxism is cause by pressure, but I don't think it's related with my case as I bitting my teeth during sleep since I am a teenager.

One of the most common treatment is using the "Mouth guards" when sleeping.
I also did found a equipment to stop Bruxism - a product called GrindAlert. I really don't know how true it is. As this product located at USA, costly at US$395.00 and I don't think I can try it for free 21 days.

I think I have to visit the dentist to get some help.