When is a siwak used, and what are the noble hadiths indicating that?

Using the Arak stick (Miswak) is a Sunnah (prophetic tradition), it purifies the mouth and pleases the Lord. It is recommended when performing ablution (Wudu), during prayer (Salat), when performing night vigil prayers (Qiyam al-Layl), for the fasting person at the beginning of the day, when reciting the Quran and engaging in remembrance (Dhikr), when performing dry ablution (Tayammum) and ritual bathing (Ghusl), upon entering the home, at every gathering, before sleeping and during marital intimacy, and when the mouth odor changes.