These things will make your teeth yellow, see if you have done it!
Throughout the ages, people have taken great pains to pursue a white tooth. As early as 4,000 years ago, ancient Egyptians began to whiten their teeth. They mixed pumice powder with white vinegar to make whitening agents. In ancient Romans, urine was used to whiten teeth! Yes, you are right. Because the ingredient in urine [ammonia] is a bleach. In modern civilized society, although these absurd methods will not be used, human beings’ pursuit of dental beauty has never stopped. Don’t try these unreliable whitening methods again. Nowadays, there are many unreliable tooth whitening methods on the market. Some people use whitening mouthwash, but if they really want to achieve whitening effect, they are very testing the technology. Although mouthwash Read More …