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
stipend definition: The definition of a stipend is a sum of money paid at regular intervals. (noun) An example of a stipend is a small sum of money paid to a graduate teaching assistant by the school to cover living expenses. ...