The areca (betel) nut: clinical implications for dental practice in the United States.

Areca nut (AN), commonly known as betel nut, has been used for centuries in ceremonies and rituals, consumed for unproven therapeutic effects, and abused as a recreational psychostimulant. AN is the fourth-most commonly abused psychoactive substance globally-only behind caffeine, nicotine, and alcohol-and its consumption is strongly associated with the development of adverse oral effects, most notably potentially malignant oral disorders (eg, oral leukoplakia and oral submucous fibrosis) and oral malignancies. Examples of other areca-related oral adverse reactions include profound dark brownish-blackish extrinsic staining, dentin hypersensitivity, periodontal disease, and betel chewer's mucosa. AN use is becoming more prevalent in Western countries, such as the United States, as a result of increasing immigration from regions where the habit is endemic-such as the Indian subcontinent and Southeast Asians. However, US dental practitioners are likely unfamiliar with the habit and its significant clinical implications for oral health. Informing these practitioners is essential to identify users and to communicate effectively with them, along with managing the oral complications. This narrative review synthesizes current evidence on AN use, with emphasis on US regulations and policy considerations, oral health effects, and findings from US-based studies of users of AN. Furthermore, we offer perspective about knowledge gaps (eg, increasing public awareness) and the ramifications for US dental practice.