Sewaak

 'Aishah reported from the Prophet (ﷺ): "Siwak is a means of purification for the mouth and is pleasing to the Lord."

عَائِشَةَ، عَنِ النَّبِيِّ صلى الله عليه وسلم قَالَ ‏ "‏ السِّوَاكُ مَطْهَرَةٌ لِلْفَمِ مَرْضَاةٌ لِلرَّبِّ ‏"‏ ‏.‏
Nisa’ee 5
Saheeh