Hi Welcome to HEALTHCARE MAGIC..

I have gone through your query and can understand your concern...
First of all sunken cheek is not a symptom of any parotid gland problem. Most parotid gland problem will have swelling and severe untolerable pain.
You might be having some buccal swelling or pain in spaces around the tooth, which is commonly are result of tooth infection.
Nothing to worry consult an Oral Physician and he will do an x ray to confirm any infection arising from tooth.

Hope your query is solved
Get well soon

Hi..
Welcome to HEALTHCARE MAGIC..

I have gone through your query and can understand your concern...

As per your complain and presentation of symptoms root canal treatment does not lead to sunken cheeks and the cause may be something else..
Mostly in case of any dental issue sunken cheek is seen after multiple dental extractions and progressing in age leading to inward curving of cheek..

You may have a false feeling of having a sunken cheek if there is some swelling on the opposite cheek or on the malar prominence of the face on the same side leading to dipped or sunken appearance of the cheek..

If there would be any disorder associated with the Parotid gland then also there are chances of having swelling and not sunken appearance..

Any incidence of sunken cheek after root canal treatment is hardly known and you should consult a cosmetic surgeon to get evaluated for the cause of sunken cheek and get treated accordingly..

Hope this information helps..

Thanks and regards..
Dr.Honey Nandwani Arora..