Does it? Isn't it well established now that getting the vaccine does not protect infection, only the severity of the disease. If teachers want to protect themselves, then they should get the vaccine.
It protects the teachers unable to get the vaccine, or those who have the vaccine but are still vulnerable.
I personally know a J&J vaccine recipient (but no booster) who is currently intubated. I know someone else who had Guillain-Barré from Covid (who had been vaccinated) and can no longer get vaccines.
How does it protect the teachers? They will inevitably be exposed regardless of whether the students are vaccinated. Teachers are able to wear additional PPE if they feel their own vaccination doesn't provide sufficient protection.
Does it? Isn't it well established now that getting the vaccine does not protect infection, only the severity of the disease. If teachers want to protect themselves, then they should get the vaccine.