I'm about 6 months out of radiation, and taste has not fully returned, but has gotten better.

I never did loose the salt taste, but sweet taste became very weak. The first bit of something would be sweet and then the taste would fade. It still does but has improved a good bit.

At first, anything sour would burn my tongue, even tomato sauce. I've been taking zinc supplements and I think they had helped my tongue to settle down and not burn. But the research on zinc seems very mixed.

I'm sure the degree of taste loss depends on how much radiation and exactly where on the tongue. My oncologist was very vague on what improvement I could expect.