8. Bark of Walnut Tree or Wood Ash - Home Remedy To Whiten Teeth
The bark of walnut tree and hardwood ash contains potassium hydroxide, an effective teeth whitener. You should rub your teeth with it after brushing the teeth and it helps in removing all stains from teeth. You could also try hardwood ash. While the bark of walnut tree and hardwood ash are one of the best teeth whitening cure, however, they are not recommended.
To apply the bark of walnut tree and hardwood ash to your teeth, put it directly on your toothbrush or mix it with a small amount of toothpaste. However, using wood ash too often or scrubbing it hard can wear down your tooth enamel over time and this has to taste awful, so we do not suggest it.