MSM is a chemical compound isn't it?
I wouldn't bash teachers, they have a very hard job and, much as I like kids, I would not want to do it. It's stressful and there are so many rules and pressures.
At the moment it must be terrible being in a freezing cold environment, wearing a mask, trying to teach (& babysit), a few kids who would rather not be there. Then there's the zoom teaching for those at home.....
A friend of mine gave up her teaching job at the beginning of the last lockdown, at the end of the term. She was on a contract and just didn't renew it. She took her own children out of school and she and her husband have been at home with them since. It seems to be working quite well; they live fairly rurally so there is plenty of pleasant outside space for the children (9&12 I think). However, not everyone is able to do that; I think a lot would if they had the choice.