Had a custom teeth guard made by the dentist for £65 she warned me after I had paid for it that if I grind a lot it will put holes in it. I didn't think I ground my teeth this bad but after 3 months it already has holes. Would this come under the sales of goods act as not being fit for purpose? I can't afford to pay £65 every 3 months.
I've found these custom guards which appear to do the same job, but you can get an elite version which might be more up to the job but more obtrusive when trying to sleep.http://www.guardkit.com/en/products.asp?cat=11
I play rugby too so could do with getting two.