I think that the international Teachers do not set rules or forbidden to eat in the classroom. I think that is the right to privacy and do not make trouble.
I think in foreign countries The teacher does not define rules or restrictions on eating in a classroom because they think it is a personal right and not give anyone trouble.
I think that it is not a teacher in a foreign country can define rules or restrictions in the food in the classroom because I thought that it was right of privacy and do not have to suffer?