Cold teeth

Because of the pain, I lost a lot of weight quickly.

My tooth sensitivity has become very severe.

I've been using the specialized toothpaste for several years now.

I also tried something called varnish at the dentist (like a coating).

However, it has worsened to the point that when it gets cold, my teeth feel sensitive and I have to wear a mask, and if I even take a deep breath with my mouth open, my teeth roots and gums become so sensitive that they feel numb...

The stress is high.

But I can't do root canal treatments on all teeth either...

The hospital told me to hold on as long as possible.

Do you have any experience with tooth sensitivity treatment?

Do you have any good information?

And... could it also be more sensitive due to osteoporosis?