Man Lā Yaḥḍuruh al-Faqīh
Hadith 779779 - وَ سَأَلَهُ: عَنِ اَلرَّجُلِ هَلْ يَصْلُحُ لَهُ أَنْ يُصَلِّيَ وَ فِي فِيهِ اَلْخَرَزُ وَ اَللُّؤْلُؤُ قَالَ «إِنْ كَانَ يَمْنَعُهُ مِنْ قِرَاءَتِهِ فَلاَ وَ إِنْ كَانَ لاَ يَمْنَعُهُ فَلاَ بَأْسَ.
Hadith.779 - He (Ali ibn Ja’far ) asked Him, Imam Musa ibn Jafar Al-Kadhim (as) about whether it is permissible for a man to pray with beads or pearls in his mouth.
Imam (as) said: "If it prevents him from reciting (properly), then no; but if it does not prevent him, there is no harm."