There are many pieces of equipment that have been invented over the years. Some very inventive minds have applied themselves to the problem of working out how to prevent snoring.
This equipment includes a stop snoring pillow and a snoring chin strap. Some of the equipment is very well designed and expensive whilst some can be made at home.
The difficulty with all devices is that they have to be comfortable enough for the snorer to wear whilst usually being uncomfortable enough to prevent the wearer from adopting a certain position (usually sleepin on your back) or alowing their mouth to drop open. For this reason equipment never seemed an effective option for me.
My wife had been told by someone that the answer to how to prevent snoring was to sew a tennis ball into my pyjama top! The problem with that of course is that I don't wear pyjamas...