A Chinese man in Tianjin who contracted COVID-19 found his tongue and teeth turned black.

In the video, black stains were visible on his tongue and in the gaps between his teeth.

Fortunately, his tongue and teeth turned much lighter than before now.

After searching the cause online, the man was shocked to find that he may have the "black hairy tongue" disease.

It was reported that since the Chinese government eased COVID-19 restrictions at end of November, an increasing number of people got infected with COVID-19.

Quarantine became no longer compulsory and people could choose to stay home and treat themselves. Also, the peak of the epidemic will probably last until after the Spring Festival at the end of January next year.

Chinese medical professionals have theorised that a weakened immune system and a high temperature due to COVID-19 may have contributed to this. It has not been confirmed if there is a direct link between COVID-19 and black hairy tongue.

The video was filmed on December 17 and provided by local media with permission.

12月17日，天津，一男子确诊新冠后意外发现自己的舌头和牙齿都黑了。视频中的他舌苔明显带有黑色，牙齿缝隙中也能看到黑色印迹。
男子称自己如今浑身疼还怕冷，感觉像是刚做完大手术似的无法比喻。但相比于之前让他庆幸的是，自己的舌头和牙齿颜色都浅了很多。
事后男子网上查询原因后也吓了一跳，发现自己患上的可能是 “黑毛舌”疾病，而这可能是与自己患上新冠后免疫力降低再加上抽烟有关，以后他要注意自己的健康了。