Hi. It must be calculus about whom you are talking. Plaque is a transparent invisible layer which gets removed by brushing only. You have to maintain your oral hygiene after a dentist does Scaling, it's entirely in your own hands after that.
Home remedies are not for 100% problems, if you are not getting results then visit the experts to get the required results. You are just 13 years old so my advice for you is to just brush properly twice daily, don't try here and there for astonishing results.