Hadith 2180
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4. Through the same chain of narrators as that of the previous Hadith the following is narrated
“He (the Imam) said that ’Amir al-Mu’minin has said, ‘Brushing one’s teeth cleanses the mouth and earns Allah’s pleasure.’”
وَ بِهَذَا الْإِسْنَادِ قَالَ قَالَ أَمِيرُ الْمُؤْمِنِينَ ( عليه السلام ) السِّوَاكُ مَطْهَرَةٌ لِلْفَمِ وَ مَرْضَاةٌ لِلرَّبِّ .