The only active "cure" for tinnitus is deliberate destruction of the nerves in your ears, which will render the patient profoundly deaf.
ENTs consider this the nuclear option treatment for severe Meniere's Disease, and they normally only do it when the loss of balance is so out of control that completely losing hearing becomes the lesser of two evils. It turns out that it also eliminates tinnitus. (It's done by deliberate injection of a large dose of gentamycin into the ear.)
So, why do I mention it? My ENT is a wry sort of guy, he likes to lay all the options on the line and let the patient take the lead, but he doesn't pull punches on the downside of these options. I was only in my 20s when he told me about this one, and it worked very well as a lesson in perspective. It was a bit like Ursula's, "It won't cost much, just your voice." Given the stark choice between hearing low-grade noise all the time and not hearing anything at all, the choice of learning to live with the whine in my ears was a simple one. For me, that is. My doctor *does* have a few patients who chose the nuclear option for tinnitus over the years, but vanishingly few of them. (He actually just retired after close to 40 years in practice.)
Did you know that sometimes, people with tinnitus have been diagnosed with schizophrenia, because they interpret the noise in their ears as words, and insist that they are hearing voices?