Signs and symptoms of black hairy tongue include:  Black discoloration of the tongue, although the color may be brown, tan, green, yellow or white A hairy or furry appearance of the tongue Altered taste or metallic taste in your mouth Bad breath (halitosis) Gagging or tickling sensation, if the overgrowth of the papillae is excessive 
signs symptoms black hairy tongue include:  black discoloration tongue  color may brown  tan  green  yellow white hairy furry appearance tongue altered taste metallic taste mouth bad breath (halitosis) gagging tickling sensation  overgrowth papillae excessive 
black hairy tongue