Al-Kāfi
Hadith 1566عِدَّةٌ مِنْ أَصْحَابِنَا عَنْ سَهْلِ بْنِ زِيَادٍ عَنْ جَعْفَرِ بْنِ مُحَمَّدٍ الْأَشْعَرِيِّ عَنِ ابْنِ الْقَدَّاحِ عَنْ أَبِي عَبْدِ اللَّهِ ( عليه السلام ) قَالَ قَالَ النَّبِيُّ ( صلى الله عليه وآله ) تَخَلَّلُوا فَإِنَّهُ مَصْلَحَةٌ لِلِّثَةِ وَ النَّوَاجِدِ .
5. A number of our people have narrated from Sahl ibn Ziyad from Ja‘far ibn Muhammad al-Ash‘ariy from ibn al-Qaddah who has said the following: “Abu ‘Abd Allah (a.s.), has said that the Messenger of Allah (s.a.w) has said, ‘You must use a toothpick it is beneficial for the gums and the molars.’”