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1. Is this sentence correct:


"I regret eating so much chocolate in the past, since this DEGRADED my teeth."



2. And is this sentence correct:


"Your teeth are well UPKEPT."



3. Finally, is it standard to say this in English:


"My mother uses a DENTAL PROSTHESES."

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Christine Christie1. Is this sentence correct:

It is totally unnatural, and so is the second one.


"My mother has dentures."
"My mother has dental implants."

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Christine ChristieI regret eating so much chocolate in the past, since this DEGRADED my teeth.

It's understandable, but I would say it more naturally like this:

I regret having eaten so much chocolate in the past because it has caused my teeth to decay.

Christine Christie2. And is this sentence correct:"Your teeth are well UPKEPT."

upkept isn't a word, or at least I've never heard of it.

Your teeth look good. / You've taken good care of your teeth.

Christine Christie3. Finally, is it standard to say this in English:"My mother uses a DENTAL PROSTHESES."

No. The expression is My mother has false teeth.

The term dental prosthesis is more likely to appear in a scientific article in a journal of dentistry.

CJ