45. Some clinical suggestions :-
1. Always moisten the shade guide because when in mouth, the teeth are
always moist and this has an affect on the reflection and refraction of light
and hence the color.
2. Always place the teeth in the shade of the upper lip in the position
they are to occupy. They will appear darker in this position than in hand
3.Select teeth under natural light
4.Attempt to look at the face as a whole rather than focus on the teeth.