Lemon juice is acidic in nature which works to inhibit the growth of odor-causing bacteria in the mouth. A mixture of lemon juice and salt in water acts as a mouthwash and helps in stimulating saliva production. This prevents the occurrence of a dry mouth which is one of the causes of bad breath.
Note: You can also simply squeeze a fresh lemon into a glass of water and either drink it or gargle with it to eliminate bad breath.
Ginger juice works as a natural breath freshener when used along with lemon juice. It works to neutralize bad breath while lemon stimulates saliva production.