Yes you can get it removed, he needs a scaling session at any good dental clinic near by. Yes it's a painless procedure
Next Steps
You have to take care of his oral hygienic get a dental check up done every 6months or yearly
Health Tips
Deposits means brushing is not proper... You can assist him in brushing, once you get calculus or tartar it can only be removed by scaling at a dental clinic.
Thankyou, Have a nice day :)