患者男性，４７岁。因“慢性咽喉炎”连续含服草珊瑚含片一年多，现全口牙变黑，个别牙疼痛而来我院就诊。自诉含服草珊瑚含片对“慢性咽喉炎”有缓解症状作用，故长期自购药物，不间断服用，每天１０片以上。过去无牙病史，尚未发现其它慢性、全身性疾病。很少服用其它药物。 Male patient, 47 years old. Due to “chronic pharyngitis” containing grass coral tablets for more than a year, is now all black teeth, individual tooth pain came to our hospital. Self-prosecuting grass coral tablets containing “chronic pharyngitis” to relieve symptoms, so long-term self-purchase of drugs, taking without interruption, more than 10 tablets per day. There was no history of dental problems in the past, and no other chronic, systemic diseases have been found. Rarely take other drugs.