Keratinising metaplasia of salivary glands results due to deficiency of
Vitamin A deficiency produces keratinizing metaplasia of the normally columnar ductal epithelium in the major and minor salivary glands.
Ref : Handbook of Experimental  Stomatology,edited by Samuel Dreizen, Barnet M. Levy.
Vitamin A
Thiamine
Riboflavin
Vitamin E