The VITA classical A1 D4 shade guide serves to accurately determine tooth shade.
The arrangement of the shades in the VITA classical family of shades is as follows:
A1 - A4 (reddish-brownish)
B1 - B4 (reddish-yellowish)
C1 - C4 (greyish shades)
D2 - D4 (reddish-grey)
