Hello, thank you for communicating with us for your problem. The sensation which you are feeling in your mouth and tongue of hair, it can be roughness which occurs because of many problems as it can be fordyce's spot means some skin glands are trapped in oral mucosa
(mouth). Or if you have a habit of having gutkha or pan masala then it can also cause some white and rough lesion in the mouth. So visit your dentist
nearby so that he can examine the mouth.