Some patients have teeth at B1 or A1, which are at the whitest end of our natural teeth colour. They come in asking for teeth whitening, and we often tell them that repeated whitening cannot whiten them further than a B1. If they are at A1, getting their teeth to B1 may not be discernible to the eye without a shade guide comparison.
On the other hand, dentists call super white teeth “toilet-bowl white”, because it resembles the porcelain of a toilet bowl. That’s because extremely white teeth is bluish and will appear fake. Teeth should have a warm hue to it, just like our skin. Therefore, paper-white is not a recommended result. For teeth already at A1 or B1, we would recommend a take-home teeth whitening kit for maintenance instead.