Lemon does wonders. The lemon juice mixed with warm water can be used to gargle your mouth to help get rid of bad breath. It a one of the best home remedies for bad breath.
After squeezing the juice of a lemon, use the leftover rind to rub on your teeth and gums to whiten and strengthen them. This is also a good skin cleanser and softener and good for removing dark spots, age spots and freckles from the skin.