Mouthguards: boil and bite v fitted v no gum shield

In response to people asking me about what sort of gum shield they should get, here is a leaflet from Opro:

http://www.opro.com/downloads/mgbook.pdf

Note that gum shields prevent more than losing your teeth. They reduce the potential of cuts in the mouth and concussion. Boxers don't wear a gum shield to protect their teeth.