The teacher texted me back and said thank you. What should I reply?

On Teacher’s Day, I sent a blessing text message to the teacher, and the teacher replied, thank you. In this case, you should reply. You can send the teacher a few flowers or a suitable emoticon, and then the topic is basically over.

If you want to say: Teacher doesn’t need to thank me, we students should thank the teacher. This topic has become a bit cumbersome and too pretentious to be polite. Of course, this is just my personal opinion. If you must say something, you can reply: You're welcome, happy teacher's holiday!