Snoring is not something which can be controlled or stopped by the sufferer. Its causes are discussed elsewhere in this site, however suffice to say that if people could stop themselves snoring, they would. The 'Breathe-Rite' style of nasal strips worn by some sportspeople may help with air intake during sporting activity, but have not been demonstrated to be a cure for snoring. Unfortunately, snoring is not a simple problem and almost all of these inventions fail to work. The dental applicance appears to offer help with both snoring and some cases of apnoea.
Dental plates are available from dentists with a special interest in snoring.
The tongue is attached to the lower jaw. This allows snoring to develop. Devices like this have been shown to not only reduce snoring, but in some cases of mild to moderate sleep apnoea, also correct this problem as well. For further advice on this, please see a sleep physician or a recommended dental surgeon knowledgeable in this area. A discussion with your doctor is the most appropriate course of action to follow.