Long time: Radiation therapy can have numerous ill effects on one's mouth. The lack of taste is one of these problems. It normally will resolve itself but may take years. The therapy can affect the salivary glands to reduce the fluids in the mouth for lubrication and taste. Cavities on the roots of teeth are more common. Depending on the type of rad source, area exposed, and shielding, the damages vary.
Answered 6/14/2014
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A few weeks: or at most of finishing a course of cancer drugs. The taste buds are actually damaged by the radiation and they need time to recover. Use biotin mouthwash and drink a lots of water. Get well soon!
Answered 7/27/2015
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