If I were in the shoes of a person with this situation, I would exhaust natural methods first before shifting to bleaching. For example, I’d do a ’30 day oil pulling’ commitment for myself. Everyday for a month, I’d oil pull and take ‘before and after’ photos so I could see the changes. That way, if I still wasn’t satisfied with the whiteness, I would know that I had tried less invasive strategies prior to choosing a method that may challenge my teeth.

Dip your toothbrush into a sea salt mixture. Instead of using toothpaste, dip your toothbrush into a sea salt mixture for 3–5 minutes, made by dissolving ½ teaspoon of salt in 1 fluid ounce of water, and brush your teeth with it. The salt temporarily increases the pH balance of your mouth, turning it into an alkaline environment in which germs and bacteria cannot survive.
What’s the secret of ACV? It contains compounds, including acetic acid, potassium, magnesium, probiotics and enzymes, which kill germs (dangerous “bad” bacteria) and at the same time foster the growth of beneficial “good” probiotic bacteria. Since it’s naturally acidic, it helps break down plaque or other substances stuck to the teeth. The pH of apple cider vinegar can remove stains from your teeth, which helps naturally whiten your teeth.
As one dentist reporting for the Dentistry IQ website puts it, “It is a misnomer that whiter teeth are the same as healthy teeth, since tooth color has very little to do with the health of the tooth. The consumer perception, though, is that white teeth equal a healthy mouth, and perception is reality.” (1) Here’s the good news: Below I explain several home remedies that help naturally whiten your teeth, while also improving overall oral hygiene. The kind of toothpaste you use plus regular brushing and flossing, using baking soda , coconut oil pulling, and tooth-healthy diet can all whiten your teeth naturally — in addition to offering benefits like antibacterial and antiseptic protection. You may also want to check out the Environmental Working Group’s Skin Deep Cosmetics Database recommendations for the best kinds of toothpaste for teeth whitening. 
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