Table 4 Mean and standard deviation of roughness at baseline, after one day, and after 14 days and comparison between different groups

Omnichroma coffee

O1

15

0.11^a

0.39^a

0.53^a

Venus Peral Coffee

V1

15

0.26^b

0.49^b

0.59^a

Omnichroma distilled water

O2

15

0.12^a

0.15^c

0.303^b

Venus Peral distilled water V2

15

0.23^b

0.24^c

0.406^b

P value

(One Way ANOVA)

< 0.0001*

< 0.0001*