I'm worried about my tooth sensitivity.

It's usually okay, but my teeth feel sensitive when I eat cold things or breathe in cold air.

So I went to a few dental clinics to get treatment.

Every time I go to the dentist, they say I have no cavities.

I had some gum issues, so I applied fluoride treatment a few times.

I don't think I saw much effect.

How should I care for swollen gums?