I've read articles that say teething may cause fevers and read others that say they don't. From experience, I have found both to be true and it seems to just vary from child to child. Some get a fever and some don't. One thing I've never noticed (but not saying it's not true) is if teething fevers spread.

HOWEVER, a fever is a fever and I don't allow them to stay if they have one. This is outlined in the sick policy and the parents know this before starting with me. If they questioned it, I'd just refer them to the sick policy and remind them that they agreed to these terms.

A sick child needs to be at home resting and getting medication or doing home remedies to get the fever down anyways IMO.