I think you should talk to the teacher. Children can put on makeup without much thought, but adults are not so romantic. Inviting the teacher to have a meal and talking politely at the dinner table is easy to solve the problem, which is good for the children. Otherwise, it will make the children understand the way of the world too early, which is not good, and it is likely to affect the children's body and mind, and even make them introverted, so they have to be cautious. If not, change classes or schools.