After working in the fields as a child, Zhukov was apprenticed to a furrier in Moscow at age 12. Completing his apprenticeship four years later in 1912, Zhukov entered the business. His career proved short lived as in July 1915, he was conscripted into the Russian army for service in World War I. Assigned to the cavalry, Zhukov performed with distinction, twice winning the Cross of St. George.
Plaque can be removed by a toothbrush and floss. Tartar, known professionally as calculus, is solid and require the dental hygienists' instrument to be removed. All that said, you can prevent tartar by brushing a full two minutes, twice a day.
Some sources say that white vinegar or lemon juice can be substituted for cream of tartar, but it can get tricky since you need more vinegar to get the same acidic reaction and that amount of added liquid could cause problems with the original recipe.