The top surface of my 64 year old husbands tongue has turned black. He has brushed it, to no avail. He has not taken Pepto; nor does he smoke. He drinks no more than 2 cups of coffee per day. He had periodontal surgery two weeks ago and has been rinsing twice daily with Chlorhesidine Gluconate.   Could this be the cause of his tongue discoloration?
Thanks for your query, I have gone through your query. The black tongue could be because of the mouth wash. It can stain the teeth and tongue. Stop using the mouth wash. You can use saline to rinse your mouth. I hope my answer will help you, take care. Maintain oral hygiene, proper tongue cleaning.