I'm from US and in my experience you it isn't proper call your teachers "Teacher" or even "Teacher + last name" such as "Teacher Smith. " You call them "Mr. Smith" or Ms. ( pronounced mizz) Smith. Miss is really not used very much anymore because it implies that the teacher is not married and not everyone wants to share this information. Ms. can mean either not married, married or divorced. When talking about you teachers to others you refer to them as your teachers or as "Mr. or Ms.Smith" if you are being specific. The title professor is reserved for teachers at the college/ university level, and in this case you would both call your professor, "Professor Smith" and refer to him or her to others as professor.

A professor is a teacher. A teacher is not necessarily a professor. Anyone who teaches, irrespective of title or rank, is a teacher. An unemployed person may still be a teacher. "Professor" is a job title describing seniority, just as "Senior Communication Manager" or "Sales Director" is a job title. The title "professor" stays even when a person has retired or has left his job. "Miss" is a title for a single, as opposed to a married woman without a noble or aristocratic title, in daily life as in a school. We address a married female teacher as "Mrs", as in daily life, if her husband is a commoner, even though she herself may be entitled to more senior rank. Thus Princess Anne was once "Mrs. Mark Phillips" though she was a princess of the blood royal, since her husband was Captain Mark Phillips.

Thanks Peachey!!!! :)

Makki has made a good point - in modern English culture, it is a little weird to call your teacher "Teacher". Instead, you just use a formal address. If a teacher wants you to use first his/her first name, he or she will tell you.