Mashing one strawberry and brushing it onto teeth every other day for two weeks uses the berry's malic acid to lift surface stains for a brighter smile.
Three Natural Acids From the Kitchen That Can Help Skin

Contrary to popular belief, some naturally occurring acids, used the right way, genuinely benefit skin and overall health — treating and preventing acne, gently exfoliating, and fighting wrinkles. Here's how to harness a few that are probably already in the kitchen.
Whiten Teeth With Strawberry Malic Acid
Heal Cracked Heels With Avocado
Rubbing a hollowed avocado shell onto heels for a minute each, then letting the residue absorb, uses the fruit's fatty acids to soften and hydrate rough, cracked skin.
Clear Back Acne With a Vinegar Spray
Mixing 1/4 cup each of warm water and apple cider vinegar in a spray bottle and spritzing it onto back blemishes uses the vinegar's acetic acid to kill bacteria and unclog pores.
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