Students send text messages to their teachers to congratulate them on Teachers' Day, or the teachers send back text messages.

If many students send text messages, the teacher may not be able to reply, but you should do something out of courtesy. Even if you don't reply to text messages, you should say thank you in class. Students respect teachers, and teachers should also respect students and reciprocate, especially teachers should understand this. A pretentious teacher must not be a good teacher.