Cheers for the input everyone. A poster suggested that I should keep my shock doctor. Unfortunately, it was too bulky and uncomfortable that I couldnt keep my gob shut when I used it. A real recipe for a broken jaw!

I found a website in Japan that does custom gumshields and they look spot on. But, the cheeky bastards charge double if you order from the English side of their website. SO I will get my ex lass to write the online application in japanese for me. Then I can compare my dentists gumshield with another custom one.