tooth shortening

my back teeth shortened quite a bit as I aged, and I got one crown so far, but the dentist filed it down and it is now shorter than my other teeth. I have cracks in my teeth due to biting in a pitted olive but the seed was still in it, so I may need root canal before getting other crowns, but the whole purpose of getting crowns was so my mouth could be back to its regular position , so my lips are not so pouty looking(age wise) cause it is making me drool on sides of my lips. How can I remedy this?

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