Conversation: The conversation between human and AI assistant.
[|Human|] hi my three year old son has a black /dark blue toungue and it wont go even after ive tried brushing his toungue with a toothbrush...his teeth sometimes are discoloured aswell...hes had this for 4 weeks now ...it was going but has come back ...is it serious and what is it?
[|AI|]  Hello, I can understand your concern. Was your son born with dark tongue and discolored tongue? If that is the case, then there seems to be problem in the development of the teeth and tongue, and it might be difficult to cure. However, if the black tongue and discoloration of the teeth have developed after birth, then it might be due to inadequate oral hygiene. When oral hygiene is not maintained well, plaque and debris accumulate on the tongue and teeth which may cause the discoloration or yellow discoloration. I would advise you to visit a periodontist, dentist who specializes in the treatment of oral cavity of child Chat Doctor.  He/she might also advise using a mouthwash and about the care of tongue. I hope this information helps you. Thank you for choosing Chat Doctor. Take care. Best,