12-54 (The compiler of the book narrated) that his father - may God be pleased with him - narrated that Muhammad ibn Yahya al-Attar quoted Muhammad ibn Ahmad ibn Yahya, on the authority of Ibrahim ibn Ishaq, on the authority of Muhammad ibn Isa, on the authority of Ubaydullah al-Dihqan, on the authority of Durost, on the authority of Abdullah ibn Sin’an that Aba Abdullah as-Sadiq (MGB) said,

“There are twelve characteristics in brushing the teeth with a toothbrush that is a recommendable practice. It cleans the mouth, improves vision; pleases the Merciful Lord; whitens the teeth; removes the mouth’s bad smell; strengthens the gums; stimulates the appetite; alleviates the phlegm; improves memory; increases the good deeds; and makes the angels happy.”