the matters of Wudu. Let’s listen to a summary of a clause in this regard from page 838 of Fatawa-e-Razawiyyah, volume 1: 

Paan chewers should pay attention

Imam Ahmad Raza Khan رَحْمَةُ اللهِ تَعَالٰی عَلَيْه has stated, ‘Those who are addicted to Paan know by experience that small particles of betel nuts and betel leaves (i.e. Paan) get stuck in all parts of the mouth (especially when there are gaps in the teeth) and rinsing the mouth three times or even ten or 12 times does not help in cleaning them properly. In fact, even using a toothpick or Miswak does not suffice. These particles of betel leaf and betel nut can only be removed by rinsing the mouth thoroughly with water multiple times and moving the water around each time. Rinsing the mouth in this way cannot be limited to a fixed number.

Cleaning the mouth properly has been stressed greatly. It is mentioned in many blessed Ahadees that when a person stands to offer Salah, an angel places his mouth on the mouth of the Salah-offering person and anything the person recites comes out of his mouth and enters the mouth of the angel. If, at that time, there are bits of food stuck between his teeth, the angels feel so much distress by it that nothing else causes so much distress to them.

(Fatawa-e-Razawiyyah, vol.1, pp.838)

Angels are hurt

The Beloved and Blessed Rasool صَلَّى اللهُ تَعَالٰى عَلَيْهِ وَاٰلِهٖ وَسَلَّم has stated, ‘When any one of you stands at night to offer Salah, he should clean his teeth with a Miswak because when he recites the Quran, an angel places his mouth on his mouth and anything coming out of his mouth enters the mouth of that angel.’

(Shu’ab-ul-Iman, vol. 2, pp. 381, Hadees 2117)

Likewise, Sayyiduna Abu Ayyub Ansari رَضِىَ اللهُ تَعَالٰی عَنْهُ has narrated: There is nothing more troublesome for both angels than to see their companion offering Salah with bits of food stuck between his teeth. (Mu’jam Kabeer, vol. 4, pp. 177, Hadees 4061)