Hello sir.... More deposits under artificial teeth is due to improper fitting of the artificial cap....you need to do twice brushing , flossing particularly in the artificial cap region and regular use of mouth wash should be done... scaling(cleaning) should be done regularly for every 6 months to remove the tartar deposits and bad breathe tooi...

Tar will not deposit on your artificial tooth untik and unless it is properly fitted..Get it examined properly from a dentist to see the margins and surrounding gums..Follow proper brushing technique 2 times a day with use of mouthwash and dental floss..Deep scaling is required if the tar deposits are beneath your gums.

Get your scaling and polishing ( cleaning of teeth) done regularly once a year. Brush twice a day, floss and use mouthwash. For the artificial tooth if the margins are smooth and it is fitting well then you will not get tartar there

Try getting  highly polished aesthetic cap..which will solve your problem..

Get it properly checked by a dentist and get proper prophylaxis of front teeth done If u have problem with that extract them and get implants done and maintain the oral health.