Narrated Abu Huraira: Allah's Apostle said, "Were I not afraid that it would be hard on my followers, I would order them to use the siwak (as obligatory, for cleaning the teeth).
Hadith ReferenceSahih Bukhari / The Book of Wishes / Hadith: 7240
Hadith Gradingمحدثین:أحاديث صحيح البخاريّ كلّها صحيحة