The siwaak is the Arabic word for the twigs of the Salvadora Persica also known as Arak tree or Peelu tree, and is commonly referred to as miswak in the west.
The siwaak is a natural toothbrush, toothpaste and dental floss. It comes from the Arak which is a small tree that grows up to 3 meters high. Its leaves are small, thick and oval in shape and its smell resembles that of mustard. It grows in hot climates such as Saudi Arabia, Yemen, Egypt and the other Equatorial countries. Its twigs are usually cut to a hand span in length and of medium thickness. When siwaak twigs are not available, twigs from the olive tree or palm leaf stalks are used.
Evidence from the Sunnah
There are many ahadeeth mentioning the importance and virtues of using the siwaak such as the hadeeth of Ibn Abbass that the Prophet (upon him be salah and salam) said : “I was ordered with the siwaak until I thought that something would be revealed in the Qur’aan in regards to it” [Musnad Ahmad no.2125, Ahmad Shaakir graded the isnaad Saheeh]; however the medical benefits are derived from the hadeeth where Aa’ishah reported that the Prophet (upon him be salah and salam) said “the siwaak is purifying for the mouth and pleasing to the Rabb” [Sunan An-Nasaa’ee no.5, Shaikh Al-albaabi graded it as sahih).....
Read more on www.prophetic-medicine.com