I find most OS go for pharmacologic interventions before anything. It would be best to go with a tricyclic antidepressant if you go that route. ( Amitriptylene or Nortriptylene) as they have been shown to decrease the number of bruxism events. However, it is only a short term solution, and probably only a go if you're having sleep issues also.
I take it he thinks you are bruxing excessively at night ?