✅ Answer: Please consider the following narrations:

1⃣ عَنْ مُحَمَّدِ بْنِ عَلِيِّ بْنِ مَحْبُوبٍ عَنْ يَعْقُوبَ بْنِ يَزِيدَ وَ بِإِسْنَادِهِ عَنْ عَلِيِّ بْنِ مَهْزِيَارَ جَمِيعاً عَنِ ابْنِ أَبِي عُمَيْرٍ عَنْ حَمَّادِ بْنِ عُثْمَانَ عَنْ مُحَمَّدِ بْنِ مُسْلِمٍ قَالَ سَمِعْتُ أَبَا جَعْفَرٍ يَقُولُ لَا يَضُرُّ الصَّائِمَ مَا صَنَعَ إِذَا اجْتَنَبَ ثَلَاثَ [اربع] خِصَالٍ الطَّعَامَ وَ الشَّرَابَ وَ النِّسَاءَ وَ الِارْتِمَاسَ فِي الْمَاءِ.

📚 Al-Tahdhib, Vol. 4, p. 189

Muhammad ibn Muslim said: I heard Imam Baqir (peace be upon him) say: If a fasting person avoids three (or four) things, then whatever else he does will not harm him: eating, drinking, women (intercourse), and immersion in water.

2⃣ عَنْ مُحَمَّدِ بْنِ الْحَسَنِ عَنِ الصَّفَّارِ عَنْ أَحْمَدَ بْنِ أَبِي عَبْدِ اللَّهِ عَنْ أَبِيهِ رَفَعَهُ إِلَى أَبِي عَبْدِ اللَّهِ قَالَ: خَمْسَةُ أَشْيَاءَ تُفَطِّرُ الصَّائِمَ الْأَكْلُ وَ الشُّرْبُ وَ الْجِمَاعُ وَ الِارْتِمَاسُ فِي الْمَاءِ وَ الْكَذِبُ عَلَى اللَّهِ وَ عَلَى رَسُولِهِ وَ عَلَى الْأَئِمَّةِ.

📚 Al-Khisal, p. 286, Hadith 39

Imam Sadiq (peace be upon him) said: Five things break and invalidate the fast: eating, drinking, intercourse, immersion in water, and deliberately attributing lies to Allah, His Messenger, and the Ahl al-Bayt (peace be upon them).

✅ One of the most important nullifiers of fasting is eating, which is prohibited from the beginning of the fast at the break of dawn (Fajr) until its end at the call to Maghrib prayer. If a fasting person intentionally eats during this period, their fast is undoubtedly invalidated, and they must make up for it (Qada) and pay the required expiation (Kaffara).

However, an important point to note is that there is no difference between intentionally eating external food and intentionally eating food particles left under the teeth during the fasting period. Likewise, there is no distinction between a large amount of food and tiny food particles. If a fasting person deliberately eats leftover food particles stuck under the teeth, their fast is invalidated.

اللَّهُمَّ صَلِّ عَلَی مُحَمَّدٍ وَ آلِ مُحَمَّدٍ وَ عَجِّلْ لِوَلِیِّکَ الْفَرَجَ وَ الْعَافِیَةَ وَ النَّصْر

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