Kindly refer to the following link(s):
Does the remaining food stuck between your teeth break your fast?
Do pieces after using Miswak or tiny food particles in teeth break my fast?
Does swallowing food particles invalidate my Prayer (Salah) & Fast?
Particles of food left in the mouth while fasting
Do pieces after using Miswak or tiny food particles in teeth break my fast?
Is it mandatory to wash or rinse the mouth after eating or drinking before praying salah?