For the most part, a cup means a cup â just measure out a cup of grapes or a cup of chopped carrots, and ta-da, you have your measurement. There are a few exceptions, though. 1  When it comes to salad, a cup is not a cup. 2  It takes 2 cups of leafy greens to equal 1 cup of vegetables.
You should never rinse with hydrogen peroxide to whiten your teeth! This will not only not whiten your teeth, but you can do significant damage to your gums and lining of your mouth. You can also disrupt the normal flora of bacteria in your mouth. If you want to whiten please see your dentist for options.
Swishing with hydrogen peroxide in very mild dose can keep the stains away but for whitening, you need a bit more prolonged action than 1 minute. So , it is safe in mouthwash forms (e.g. Peroxyl from Colgate ) but would not whiten teeth.