A. Botox is used to paralyse muscles which has been shown in some people to reduce tooth grinding.  It is an option but I would rather you had a proper consultation and found out the cause of your grinding.  It could be due to the way your teeth bite together so can be treated possibly with orthodontics and cosmetic rebuilding.  It is important that the night guard you wear is made of a hard acrylic material as softer night guards do not reduce the grinding as much.