When the breath smells very bad, it offends the people who are close to you. When people meet you and they notice your bad breath, it leaves a very bad impression. You can detect bad breath by blowing out a breath on a hanky and then smelling it. If you get an awful smell, it means that you have bad breath. The main cause of bad breath is keeping the mouth dirty. If there is plaque in the mouth, it can cause growth of bacteria. Bad breath is also caused by leftover food deposited in the teeth, which gets decayed. The top 20 home remedies for bad breath are as follows.