Table 2.
Descriptive statistics showing colour changes, ΔEB (ΔE at baseline), ΔE1 (ΔE after 1 month) andΔE2 (ΔE after 2 months) for each of the specimen in Group 1, Group 2 and Group 3
Official websites use .gov
A
.gov website belongs to an official
government organization in the United States.
Secure .gov websites use HTTPS
A lock (
) or https:// means you've safely
connected to the .gov website. Share sensitive
information only on official, secure websites.