I am also facing the same problem of tongue inflammation.
I have completed almost three and half months after radiation and chemo.Can any body say normal period this problem persists.
I find it difficult to brush with tooth paste also.

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KVSatyanarayana, 53 yr,non-smoker,non-alcoholic,worked in lead and zinc industry for 25 years, T2N1M0, found in oct-13. wide glossectomy and MND type -II ( 17/10/13)
,6000 cGY radiation for 30 days.with chemo(cis-platin)(31/12/2013)