With what fast and efficient whitening teeth? Has anyone ever used a tooth patch?

Ultrasonic molar stains in stomatological hospitals are inexpensive and last for about 30 minutes. Unlike previous drugs for whitening teeth, ultrasonic waves will not cause too much harm to teeth. If conditions permit, the teeth can be polished, so that the tooth stains are not easy to adhere, and the beautiful and lasting effect can be achieved. Thank you for your adoption.