Seeing something noticeable other then normal in your body is a sign of attention to be taken. In your case, as you are saying hairy tongue appearance, is a condition not to be ignored. Without looking into your current situation diagnosis and treatment options can't be decided.
It's better you consult with a dentist as soon as possible.
Next Steps
1.Book an appointment with me to get an expert advice and get the treatment options through consultation.
Health Tips
1.Maintain good oral hygiene.
2.Night brushing.