What should eloquence teacher call him?

The title of eloquence teacher should be teacher's surname plus teacher, plus hello.

There is no regulation on the address of eloquence teachers in special industries, which can be carried out according to the common manners in society, that is, adding hello after the teacher's surname.

Address refers to the address forms that people use in daily communication and entertainment. In interpersonal communication, choosing the correct and appropriate address reflects one's upbringing, the degree of respect for the other party, and even the development of the relationship between the two sides and social fashion, so it can't be used casually.