But you have to understand, they should be talking about porcelain teeth and tooth whitening. Not orthodontics. Orthodontics requires braces, and it will take at least one year to be effective.
What can be whitened in an hour or two is cold light whitening, which can only improve the color of teeth. But also discolors on light and moderate teeth. If it is a severe dental fluorosis or tetracycline tooth, or the color of the tooth is very uneven, then this whitening effect is not good.
There are two times to make porcelain teeth, the first grinding and the second wearing.
No one can guarantee that the finished teeth will last a lifetime. No matter how good the material is, he can't guarantee your own use and maintenance. Maybe the porcelain tooth is fine, but your own tooth has fallen off due to periodontal problems or loose worm teeth, so this porcelain tooth still needs to be pulled out. The most important thing for porcelain teeth is your daily maintenance.
It is not enough for him to say twice if he wants to arrange his irregular teeth neatly. He is talking about porcelain teeth and cold light whitening.