What is a siwak, what is the ruling on using it, what are the times for using it, what are its characteristics and how is it used, and does a flavored siwak have the same ruling as a regular siwak?

The siwak purifies the mouth and pleases the Lord. It is recommended at all times, and its recommendation is emphasized when performing ablution (wudu), prayer (salat), entering the home, waking up from sleep, when the mouth odor changes, entering the mosque, reciting the Quran, and attending dhikr gatherings. It is permissible for a fasting person to use the siwak at the beginning and end of the day. The best material for siwak is the Arak stick. It is permissible to use any pure, non-harmful stick for siwak, and this includes toothbrushes. It is forbidden to use poisonous or impure sticks for siwak. It is disliked to use those that cause bleeding or harm. It is recommended for the siwak to be of medium thickness and length, and it is recommended to start with the right side horizontally. The siwak should be washed after use and kept away from impurities. The sunnah (prophetic tradition) is not fulfilled by using a finger for siwak, but it is permissible to use modern dental cleaning tools and those with flavor, as long as they are not harmful. A fasting person should avoid anything with flavor.