How should the place and manner of using the siwak be, in veneration of the Sunnah of the Chosen One, peace and blessings be upon him, taking into account the prohibition of spitting during prayer or in the faces of people? Should the siwak be used before or after ablution, or at home or when going out for prayer? Is it better not to use the siwak during conversation or during the iqamah?

We understand from your question that you object to using the siwak (tooth-stick) in public. We inform you that the prohibition of spitting out phlegm during prayer is incorrect if it is into one's garment or a handkerchief. However, spitting out phlegm in the faces of people is forbidden because it harms a Muslim. Comparing the siwak to spitting out phlegm is unacceptable. Using the siwak in public is not forbidden; rather, it is a confirmed Sunnah (practice of the Prophet). The Prophet, peace and blessings be upon him, used the siwak in the presence of his Companions. Therefore, one should not object to someone who follows the Sunnah and uses the siwak in the mosque before prayer. You must make your inclinations subservient to what the Prophet, peace and blessings be upon him, brought, and be wary of the misconceptions that are propagated to divert people from the Sunnah.