みが.く、す.る

磨, 麻, 广, 厂, 林, 木, 石, 口

grind, polish, scour, improve, brush (teeth)

歯磨き(はみがき): (1) dental brushing; brushing one's teeth (2) dentifrice; toothpaste; tooth powder
磨く(みがく): (1) to polish; to shine; to brush (e.g. teeth) (2) to refine; to improve