Siwak (Miswak) It is a means of purifying the mouth, pleasing to the Lord.
[Sahih al-Bukhari, Sawm, 27]
It has been mentioned in one narration that the Namaaz which is performed after Miswak is 70 folds more exalted than the Namaaz which is performed without making Miswak.
[Shu'ab al-Iman, Vol. 3, Page 26, Hadith 2774]
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