刷牙的正确步骤如下:
1.先刷牙齿外侧，将牙刷刷毛与牙齿表面成45度角放置并轻轻按压在牙齿与牙龈的交界处，以小弧形来回轻轻刷，上排牙齿从牙龈向下刷，下排牙齿从牙龈向上刷，如下图所示。
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2.然后刷咬合面，将牙刷平放，以适中的力度来回刷牙齿的咬合面，如下图所示。
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3.接下来刷内侧，竖起牙刷，用牙刷前端上下轻轻清洁牙齿内表面，如下图所示。
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4.最后轻刷舌头表面，由内而外清除食物残渣和细菌，可以保持口气清新，如下图所示。
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注意事项:
1.为了控制牙菌斑，保持口腔卫生，预防口臭，成年人每天至少要刷牙两次，每次3分钟以上。
2.牙膏主要起摩擦剂的作用。刷牙前不要用水接触牙刷。水将减少牙刷、牙膏和牙齿之间的摩擦。同时刷洗方式应该是竖刷而不是横刷。
3.牙刷用完后，要将刷头内的水强行排干，以免滋生细菌。建议每三个月更换一次牙刷。