生活百科：护牙系列之九——怎样自然地美白牙齿

Steps 步骤

Do not whiten teeth if you have cavities, open sores, gingivitis, or other gum disease.
（口腔有任何不适者，建议不要美白牙齿）

STEP 1
Make the paste
制作”牙齿美白剂“

In a small bowl, mix 2 teaspoons each of baking soda and hydrogen peroxide. Stir until it is the consistency of regular toothpaste. You may need to add a bit more peroxide.

Add a drop or two of sugar-free mint flavoring.

STEP 2
Brush your teeth
刷牙

Apply the whitener to a toothbrush and use as if it was regular toothpaste. Leave the whitener on your teeth for at least two minutes.

STEP 3
Rinse
漱口

Rinse thoroughly. Do not swallow the whitener solution.

Try rinsing with cranberry juice to get rid of the whitener's taste; it also kills bacteria.

STEP 4
Put away the extra whitener
将多余漂白剂放好

Cover the bowl with the plastic wrap and set the extra whitener aside for another use.

STEP 5
Repeat
重复

Brush with the peroxide paste no more than once a week. Hydrogen peroxide can cause tissue damage if used too often.

Tooth enamel is the hardest tissue in the human body.