If a product contains bleach (peroxide), it will whiten your teeth. But not all treatments are created equal. It's the concentration or percent of hydrogen peroxide a teeth-whitening system contains and the amount of time it's in contact with your teeth that determines its effectiveness.
Definition of fecund - producing or capable of producing an abundance of offspring or new growth; highly fertile Definition of fecund - producing or capable of producing an abundance of offspring or new growth; highly fertile
concubine definition: The definition of a concubine is a woman who is a mistress to a man with a wife or who cannot be married to her because of a difference in social status. (noun) An example of a concubine is one of the mistresses of an important king...