Toothbrushing became popular during the World War I.
第一次世界大战期间，刷牙开始流行起来。
2
Stroke-related difficulty in toothbrushing and denture wearing were associated with higher oral yeast carriage(P<0.05).
伴随刷牙困难及佩带活动义齿的中风患者的口腔念珠菌负荷较高（P〈0.05）。
3
The investigators made allowances for factors such as age, gender, smoking, alcohol intake, frequency of toothbrushing, blood sugar and cholesterol levels.