How long does it take for my bruxism night guard to alleviate the jaw pain?

Fairly quickly: Bruxing can cause pain in several different ways, from temporary spasms of the muscles related to chewing to arthritis of the tmj. If the primary pain is due to muscle strain, within a week you should feel better. If the night guard is not working after that, you may need to adjust or modify the night guard. Make a followup appointment with your dentist in case it doesn't help.

May not: Just a night guard may not insure success in alleviating your jaw pain. You may need addition exercises and therapy. Should see a dentist/tmj specialist.

Depends: Depends on what is causing the jaw pain. You should see immediate improvement if the night guard is properly adjusted. If it has been adjusted a couple of times and you still have pain there might be something wrong in the jaw joint itself. Go back to your dentist and have him check for any lateral interferences in the adjustment of your night guard.

Few days: You should start noyicing the difference in few days.

Depends: How severe is your tmj/tmd? Is it muscle or myofacial pain you're experiencing. Is your bite way off? Do you have parafunctional habits... Sometimes, simply just having a guard or splint is not enough. Check with your dentist or TMJ specialist.