It is still possible by hand strenght with available tools on the market, or with some descaling agents, however the experts recommend that we should not perform at home because of the dangerous risks.
Since hard the tartar adheres to the teeth, which makes it very difficult to perform, along with the fact that we ourselves scrape it at home, we will not be able to observe each niche in the tooth carefully to scrape it, which may cause damage to the teeth and gums, and you will also not be able to clear all of them.
Therefore, the best way to safely scrape tartar is to arrange your time to go directly to the dental clinic to get high skilled doctors, many years of experience with professional equipment and tools to do it.