How can i get my husbands swollen gum to go down with out going to a dentist it's swollen around his back tooth after he was sick?

Gingivitis, See DDS: If you have swollen gum, it may be a sign that you are at risk for or already have gum infection. Gingivitis is a serious problem, which should be checked by a dentist. Keep a good oral hygiene and call a dentist for appointment to prevent future health complications.

Determine the cause: Is the swelling due to his recent cold or due to food impaction near an erupting wisdom tooth? Brush the area well and keep it clean.. if the problem persists he may need to have his wisdom tooth extracted.

You're not a Doctor: Your husband may very well have an infection that requires care by a professional. You can do more harm than good. Get him to a Dentist, NOW. Don't be foolish. This is NOT a DIY project.

Salt rinse/IBU: clean gently, do a warm salt rinse 2 times per day and take 600mg ibuprofen for the inflammation