Is it okay to get 6 zirconia crowns on my front teeth?

Hello!
The reason I am writing is that, as you can see in the photo, only the two checked teeth are currently hurting..
The other teeth do not hurt.
However, when I went to the dentist, they suggested that in addition to the 2 painful teeth, I should do 4 more,
making a total of 6 teeth for root canal treatment and zirconia crowns..
They said that since the other teeth are heavily worn down, I might as well proceed with all 6 at once..
Can I just proceed with the 2 painful teeth for now and do the others separately later?
Or would it be better to do them all at once?
I am conflicted about what to do..
Please give me some advice~!