The normal colour of the gums is a coral pink. The normal texture is firm and a stippled appearance, also called orange peel appearance. When the gums is infected due to plaque bacteria, it causes gingivitis. This is a mild form of gum infection. When this condition is left untreated and it progresses to the advanced gingivitis, redness of the gums is seen. The inflammation in the gums causes it to become swollen with a red shiny appearance. Proper brushing and flossing prevents redness of gums.