if they're "working overtime" fighting an infection. This tends to be particularly true for people... in with your doctor and make sure that the infection hasn't traveled or that there isn't some more serious issue...
This question can only be answered after a physician and dentist have examined you. But the teeth and gums are at the start of your digestive tract and if they cannot begin to process yo ur food, you will have problems.
Never trivialize an acute pain such as your husband is experiencing. I would suggest that you take him to an urgent-care dental facility or hospital emergency room. They will be able to diagnose the problem and start to rel