Ok ... I know that Kangbeijia's cold light whitening is about 1500. I have done this cold light whitening, but I don't recommend it. I suggest you try its 360-color light whitening, which is better than cold light whitening ... Color light whitening has the advantages of quick response, safety and low sensitivity, and is one of the most prominent tooth whitening methods. ③ Effect: The average color of teeth was improved by 6- 14 grade, and the whiteness was obviously improved.

④ Time: about 30 minutes. It is recommended to do it once or twice every two years. ⑤ Effective time: it will take effect after 30 minutes each time.

⑥ Effect retention time: more than two years. The price1800,300 yuan, but the effect is really good and natural. ...