Miswak
The miswak is predominant in Muslim areas but its
use predates the inception of Islam. Its use has
spread from the Middle East to South and Southeast
Asia, where it is known as Kayu Sugi (Malay for
'chewing stick').
Although not mentioned in the Qur'an, use of the
miswak is frequently advocated in the hadith.
Situations where the miswak is recommended to be
used include before salat, before entering one's
house, before and after going on a journey, on
Fridays, before sleeping and after waking up, when
experiencing hunger or thirst and before entering any
gathering.
Miswak The miswak (miswaak, siwak, sewak) is an effective natural oral care solution. The miswak is made from the root of the peelu tree (Salvadora persica) known in Arabic as "arak". Research indicates that miswak suppresses decay-causing bacteria, gingivitis and plaque formation, among many other benefits. It is often mentioned (in hadith) that the Prophet Muhammad (PBUH) recommended its use.
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How to use a miswak/siwak:
Simply scrape off bark from the tip and chew the tip gently until
brush-like. When the bristles are worn and the flavor has subsided,
replace in wrapper. Store in a cool dry place.
Examples of hadith concerning the miswak:
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 Siwak
on every performance of ablution."
Aisha said, "The Prophet said, 'It (i.e., siwak) is a purification for the
mouth and it is a way of seeking God's pleasures'."
'Abd al-Rahman son of Abu Sa`id al-Khudri reported on the authority
of his father that the Messenger of God said: "Bathing on Friday for
every adult, using of Miswak and applying some perfume, that is
available-these are essential. So far as the perfume that is concerned, it
may be that used by a lady."
For more info on miswak see these Wikipedia articles: