I just wore braces recently, and I will come to study soon. I am a teacher, and I don't know how to face my students. Ha ha! I just went to a new school.

It's nothing. Students in Grade Two of primary school will definitely laugh at you, but as a teacher, you can't be angry or so thin-skinned!

Just tell the students that when you were their age, you didn't take good care of your teeth, and now you need braces, so please ask them to take good care of their teeth and so on. . . . .

As for self-introduction, for primary school students, we should say something easy to understand!