I've had all my metal fillings removes and replaced with composites..
The doctor saw no signs, nor do I have enough symptoms for sinus infection
My gums were deep cleaned 3 months ago and I brush twice and floss once daily.
This is part of why I'm so baffled.
Also, as i mentioned, this is not a metallic taste like people describe with anxiety or acid
reflux.. this is a foul taste.