Why there's no consensus on whether or not night guards helps to treat bruxism?

Bruxism: It's a complicated issue and has a very wide range of degree, causal factors and variance in individual patient conditions. There is also a broad range of Dentist's experience, training and philosophy. Finally, each case has to be individually evaluated. Find a dentist whom you trust and follow the advice.

Bruxism and NG: Bruxism is a sleep related disorder. There are no reliable methods for assessing bruxism in the clinic which have reasonable diagnostic validity. In the absence of definitive evidence, bruxism can be managed by occlusal appliances counseling and pharmacological interventions.