The miswak is a teeth cleaning twig made from the Salvadora persica tree (known as arak in Arabic). A traditional alternative to the modern toothbrush, it has a long,
well-documented history and is reputed for its medicinal benefits.It also features prominently in Islamic hygienical jurisprudence.
The miswak is predominant in Muslim-inhabited areas. It is commonly used in the Arabian peninsula, the Horn of Africa,
North Africa, parts of the Sahel, the Indian subcontinent, Central Asia and Southeast Asia
Narrated Abu Hurairah:
The Prophet said, "If somebody eats or drinks forgetfully then he should complete his fast, for what he has eaten or drunk, has been given to him by God." Narrated 'Amir bin Rabi'a, "I saw the Prophet cleaning his teeth with MisSwak while he was fasting so many times as I can't count."
And narrated Abu Huraira, "The Prophet said, 'But for my fear that it would be hard for my followers,
I would have ordered them to clean their teeth with Miswak on every performance of ablution." The same is narrated by Jabir and Zaid bin Khalid from the Prophet who did not differentiate between a fasting and a nonfasting person in this respect (using Miswak).
Aisha said, "The Prophet said, "It (i.e. MiSwak) is a purification for the mouth and it is a way of seeking the acceptance of God." Ata' and Qatada said, "There is no harm in swallowing the resultant saliva."