Final answer:
The subject of this question is Biology. Electric toothbrushes use high-speed rotational or oscillating movements to remove plaque from the teeth.
Step-by-step explanation:
The subject of this question is Biology. The high-speed rotational device mentioned in the question is likely referring to an electric toothbrush. Electric toothbrushes use high-speed rotational or oscillating movements to remove plaque from the teeth. The abrasives in toothpaste, such as particles of aluminum hydroxide and calcium carbonate, aid in the removal of plaque and tartar.