There is no one standard system in the dental branch to measure and determine tooth color. Nor is there a precise answer to how white your teeth can become – every individual case is unique. One commonly used reference tool, though, is a shade guide.
Shade guides divide tooth color into four fundamental shade ranges:
A – reddish brown
B – reddish yellow
C – gray
D – reddish grey
Within each range are different levels of darkness, which results in a chart detailed enough for almost everyone to find their exact tooth color on the guide.
To use such a guide, simply match your current tooth color to the corresponding color on the chart. This will be a starting point as you decide how much whiter you'd like your teeth to be.
How white should your teeth become?
There is no one right way to whiten your teeth. Some people want an immediate and dramatic change, while others favor more gradual whitening like the type that results from a whitening toothpaste or gel. Concluding results depend on your natural tooth color, how obstinate any stains are and the treatment you choose.
Bear in mind that:
A change of just two or three shades can make a noticeable difference in just about anyone's smile.
While whitening can infrequently change tooth color nine or more shades, the majority of people who whiten their teeth see a change of between two and seven shades.
Each procedure has its advantages and disadvantages. Laser whitening and other in-office bleaching procedures, for instance, may lead to the most dramatic results, but cost considerably more.