“…The colour of the healthy gingiva is variable ranging from pale pink to deep bluish-purple and this is determined by several factors namely size and number of blood vessels, epithelial thickness, epithelial keratinization and amount of pigmentcontaining cells within the gingival epithelium. 2,6 Most of the pigmentation is caused by five primary pigments that are Melanin, Melanoid, Oxy-hemoglobin, Reduced haemoglobin, and Carotene. 7 Gingival hyperpigmentation can also be caused by smoking, trauma, infections, certain precancerous lesions, systemic conditions (Addison disease, Peutz-Jeghers disease, Albright disease) or drugs (tetracycline, colchicines etc).…”