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
maintenance - means of maintenance of a family or group bread and butter, keep, livelihood, sustenance, living, support - the financial means whereby one lives; each child was expected to pay for their keep; he applied to the state for support; he could no longer earn his own livelihood