I know of people have gotten .T.N. from sinus infections and tooth decay
as the infection can spread and damage the t.n. nerve . the sinus and also teeth are all close to the t.n. nerve. so infection can travel and one can get T.N.
also I know there is a connection for M.S. folks many have t.n. but it dose not go the other way around.
people with t.n. dont get MS from having T.N. .