牙医建议他们的病人定期 刷牙并用洁牙线剔牙
Dentists advise their patients to brush their teeth regularly and floss their teeth
以上为机器翻译结果，长、整句建议使用 人工翻译 。
牙医建议他们的病人定期刷牙并用洁牙线剔牙，防止蛀牙。
Dentists advise their patients to brush and floss regularly to prevent their teeth from decaying.
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