Hadith.779 - He (Ali ibn Ja’far ) asked Him, Imam Musa ibn Jafar Al-Kadhim عليه السلام about whether it is permissible for a man to pray with beads or pearls in his mouth.
Imam عليه السلام said: "If it prevents him from reciting (properly), then no; but if it does not prevent him, there is no harm."