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
Fecund and its synonyms fruitful and fertile all mean producing or capable of producing offspring or fruit-literally or figuratively. Fecund applies to things that yield offspring, fruit, or results in abundance or with rapidity (a fecund herd; a fecund imagination). Fruitful emphasizes abundance, too, and often adds the implication that the results attained are desirable or useful (fruitful plains; a fruitful discussion).