STEP 1：步骤1
Mash the strawberry with a fork and mix it with the baking soda. The baking soda buffs away stains from coffee, tea, and blueberries that penetrate your enamel over time.

STEP 2：步骤2
Using a soft toothbrush, apply the mixture to the teeth you want to whiten.

STEP 3：步骤3
Let the mixture set for five minutes.

STEP 4：步骤4
Brush your teeth with toothpaste as usual. Floss to get out any seeds from the strawberry.

Rinsing with a little hydrogen peroxide mixed with water after brushing kills bacteria and whitens teeth.

STEP 5：步骤5
Rinse your mouth with mouthwash to wash away residual acid. Your teeth will be gleaming and stain-free.

In the Middle Ages barbers also practiced dentistry.