1620px-areca_nut_vendor_hainan_jan_2010

Areca nut (betel nut) vendor with red mouth from areca consumption preparing betel leaves. Betel nut chewing is associated with an increased risk of oral submucous fibrosis, oral carcinoma, etc. | Rolfmueller – CC BY-SA 3.0, https://commons.wikimedia.org/w/index.php?curid=8982295

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