sometimes tinnitus is linked to problems with the TMJ (joint near your ear). If you are grinding alot or have had damage done to the joint for some or other reason eg occlusion problems, the symptoms can include ringing or other sounds in the ears.
I would advise you to see a maxillofacial specialist, have xrays and other investigations of the joint done and then proceed with treatment depending on the findings. sometimes a "guard" is all that is necessary to treat the condition, more extensive treatment involves surgery but this is rare.

HOWEVER you first need to ascertain if the sound is indeed a cause of the TMJ, so I suggest a consult with an ENT specialist as well