Toilet paper is a soft paper product used to maintain personal hygiene after human defecation or urination. It differs in composition somewhat from facial tissue, and is designed to decompose in septic tanks, which some other bathroom and facial tissues do not. Most septic tank manufacturers advise against using paper products that are non-septic tank safe. Different names are used for toilet paper in countries around the world, including "loo roll/paper", "toilet roll", "dunny roll/paper", "bog roll", "TP", or "bathroom/toilet tissue". There are also numerous vulgar slang terms.