Is it possible for ten devils to be present in one person, what is the effect of that, and how can they be removed?

The possession of humans by devils is something established by Sacred Law, and a person may be affected by it and suffer physically and mentally. The imams of Ahl al-Sunnah wal-Jama'ah (the People of the Sunnah and the Community) have unanimously agreed on the jinn entering the human body, basing their argument on the Almighty's saying: "Those who consume interest will not stand [on the Day of Resurrection] except as one stands who is being beaten by Satan into insanity," and on the Prophet's (peace and blessings be upon him) saying: "Indeed, Satan flows through the son of Adam like blood." To get rid of them, one uses ruqyah (incantation) prescribed by Sacred Law, divine protections, and the well-known adhkar (remembrances of God).