I don't usually post here, but I do need your input...
Dyna is a 6 yr old female Main Coon cat, 18 pounds,
a sweety.

Took Dyna to vet today for rabies shot.
He looked in her mouth and found a tooth with a problem.
Said that it wasn't a cavity, but rather "calcium erosion"
was just above where the gum would usually be, which
had the gum growing into it, affording some temporary protection.
He showed me that when he barely touched it, she winced,
indicating that it did pain her.

On next Monday morning we set up to take her in for 1) a cleaning,
2)x-rays, like to see if there were others
3)extracting this big, sharp,long back tooth)
He  indicated major surgery to remove this tooth,
because it has 3 roots, and he would have to go in,
take crown off, and extract each root, then clean out the jaw bone.
4) And there may be others too.
So she will be under anesthetic for some time...I'm so worried!

In the meantime I have a 200mg antibiotic pill to give her twice
daily.It is just barely short of half an inch in diameter.
Powdering it isn't working, not even in her favorite foods.

Anyone have experience with extractions due to 'enamel erosion'?
He said about half the cats get it.

In reading some posts here, I already know to ask the vet to use Isoflurane,
as a safer anesthetic.

TIA for sny experience and information you all may offer.

Sylvia