Really? Okay, so TL;DR Heavy metals == bad and can be a factor for tinnitus. Which is why I wrote a comment, the overall subject is tinnitus after all? The rest of the comment is to provide the greater context and more info. I mention that I got rid of my tinnitus right at the start, showing how it's relevant for the current discussion.
Asking that because I also got rid of my tinnitus right at the start for few months, then a year later for a couple of weeks, and now waiting for statistics on its dependency on medications that I try from time to time. Mine is psycho/bloodvessel related - when I stop taking one of these two sorts of pills, it changes its “volume” and “awareness threshold” levels.