Siwak al-Fajr refers to the highly recommended practice of using the miswak (tooth-stick) specifically upon waking for the Fajr (dawn) prayer. The miswak, traditionally from the arak tree (Salvadora persica), is a natural tooth-cleaning twig used since pre-Islamic times and strongly emphasized by Prophet Muhammad (peace be upon him). He said: "The miswak cleanses the mouth and pleases the Lord" (Bukhari, Nasa'i). The specific emphasis on using miswak at Fajr relates to the natural morning breath after sleep and the desire to approach Allah in prayer with optimal cleanliness. The Prophet (peace be upon him) would use miswak upon waking, before any other action, demonstrating its priority. He stated: "If it were not that I would overburden my Ummah, I would have ordered them to use the miswak before every prayer" (Bukhari and Muslim). Siwak al-Fajr thus combines physical hygiene with spiritual preparation,cleaning the mouth before speaking to Allah in prayer, following the Prophet's example, and earning divine pleasure. The practice also wakes the senses, helping achieve the focus (khushu') essential for meaningful prayer. Modern science confirms the miswak's benefits: antibacterial properties, plaque reduction, gum health, and natural whitening. Siwak al-Fajr reminds Muslims that worship involves the whole person,body and soul,and that small Sunnah practices accumulate immense reward while transforming daily routines into continuous remembrance. The miswak contains natural ingredients: silica (which acts as an abrasive), tannic acid (strengthens gums), and antibacterial compounds. Studies have shown it to be as effective as modern toothbrushes and toothpaste. The practice of siwak is not limited to Fajr; it is recommended before each prayer, before reciting the Quran, before entering the home, and upon waking. However, siwak al-Fajr holds special virtue because it combines the sunnah of using miswak with the blessed time of dawn prayer. The Prophet said: "The two rak'ah of Fajr are better than the world and everything in it" (Muslim). Using miswak before them enhances their virtue. For believers, siwak al-Fajr is a simple yet profound practice. It connects them to the Prophet, purifies the body, prepares the heart for worship, and starts the day with mindfulness. It is a sunnah that takes only moments but brings immense reward and blessing.