"My father told me: 'I heard 'Aishah say, (narrating) from the Prophet ﷺ: "Siwak is a means of purification for the mouth and is pleasing to the Lord."  

عَنِ النَّبِيِّ ﷺ قَالَ السِّوَاكُ مَطْهَرَةٌ لِلْفَمِ مَرْضَاةٌ لِلرَّبِّ