The tooth stick purifies the mouth and is pleasing to the Lord
It was narrated from Abu Umamah that:
The Messenger of Allah ( may the peace and blessings of Allah be upon him ) said: "Use the tooth stick, for. Jibril never came to me but he advised me to use the tooth stick, until I feared that it would be made obligatory for me and my Ummah. Were it not that I fear that it would be too difficult for my Ummah, I would have enjoined it upon them. And I use the tooth stick until I fear that I may make the front of my mouth sore.' (i.e. my gums) (or cause my teeth to fall out due to brushing them so often)."
Using Siwak is one of acts of the natural dispositions, because it is necessary to clean the mouth from the food remnants, purify it from bad odors, and remove the tooth decay, swelling, and so on.
The Siwak is a means of disinfecting the mouth: so as to prevent the diseases.
Many are the mouth diseases including: the tooth decay, which should not be tolerated, because it ends with the teeth falling one after the other, until the mouth becomes empty, and then one regrets for his negligence in cleaning the mouth with Siwak, As the wise say: health is a Crown on the heads of the healthy. Prevention of the disease is better than seeking remedy.
It is well known that the mouth - as we know - is the natural entrance to the stomach, which is the origin of the disease and the open path of the germs and viruses to the lungs, chest and digestive system. It is necessary for every Muslim to care for the cleanliness of his mouth especially if its smell changed.
There is no doubt that the using the toothpaste is loved to Allah the Blessed and Exalted when reading the Quran and the other types of remembering the Lord.
It is more beloved to Allah to remember him with a pure mouth than to remember him with a mouth that is not so.
the times when using Siwak is highly recommended are five: When performing wudoo', when praying, reading Qur'an, waking up from sleep, and if the smell of the mouth changed.