Can you brush your Teeth with Toothpaste while fasting?
It goes without saying that Islam is a religion which pays attention to the cleanliness, decency, and the good appearance and smell of its adherents. Muslims are recommended to appear decent and clean. They also are to keep their mouth clean by using a brush or miswak
Sheikh Ahmad Kutty, a senior lecturer and Islamic scholar at the Islamic Institute of Toronto states
It is absolutely fine to brush one’s teeth in the morning with toothpaste while fasting so long as one takes care not to swallow the paste. Toothpaste is not intended for consumption. Fast is only broken when it goes directly into our system. To say that one cannot use toothpaste is nothing but rigidity
The eminent Muslim scholar, Sheikh Yusuf Al-Qaradawi, adds,
If anything reaches the stomach, it breaks one’s fast according to the majority of Muslim jurists. If one is cautious and brushes his teeth and out of forgetfulness some traces of the toothpaste reach his stomach, he is not sinful, as Allah forgives the mistakes of Muslims that are made unintentionally
While the renowned scholar Zakir Naik had this to say on the specific question