The Hadith and Muslim Culture

Many practices that are prevalent in the Muslim world were never mentioned in the Quran. Instead, these practices were derived from the practices, sayings, traditions, and stories of Prophet Muhammad (peace be upon him) and his companions. These traditions are called Hadith.
Here are some examples of Muslim culture that come from the Hadith:

• Men growing their beards and trimming the moustache.
• Using the right hand to eat with and the left hand for the bathroom.
• Using a miswak (stick used for cleaning teeth).
• Shaking hands when greeting someone.

http://islamiclearningmaterials.com/muslim-culture/