ʿThe siwak is cleansing to the mouth and pleasing to the Lordʿ (Using translation from Aḥmad 7)  

عَنِ النَّبِيِّ ﷺ قَالَ «السِّوَاكُ مَطْهَرَةٌ لِلْفَمِ مَرْضَاةٌ لِلرَّبِّ»