The term 'Dentist's Tool' is composed of three crossword solutions: PICK (4 letters), DRILL (5 letters), and BUR (3 letters). A PICK is a thin, pointed tool used to remove plaque and tartar from teeth. A DRILL is a tool used to cut into teeth to remove decay or to shape teeth for fillings. A BUR is a rotary cutting instrument used to shape and smooth tooth surfaces. All three tools are essential for dentists to perform their job.