Sunny, I had about a year of bruxism (teeth grinding) which coincided with my taking of antidepressant medications. I tried one of the "boil it and shape it" sports mouthpieces you can buy in the drug stores. I stopped using it, although it fit well enough, because of its construction material. It apparently had bisphenol(? sp.) as part of its composition. This has recently come up in the news as being a component of many products, like the lining of cans, cash register receipts, plastic drinking glasses, etc. It is a potent carcinogen. If you wear that type of mouthpiece night after night, it is sure to breakdown over time and cause you to ingest this toxin. So, opt for one that is Bisphenol free....I believe that the company that sells this type of mouthpiece is called Dentec (or possibly Deltec, can't remember). I intend to get me one of them and start wearing it. But, it may be too late for me. I am a pretty old bird already, and age alone has worn down my teeth. However, this most recent scenario has really done a job on the top surfaces of my teeth. Will have to probably have some of them veneered or crowned to improve the cosmetic quality of my smile. Good luck.