Oral/tongue hygenie help!

Hello! Does anyone know why I always have a coated tongue? I've had it for as long as I can remember. It's not thrush. I scrape my tongue twice a day when brushing my teeth. It takes on the colour of whatever l'd just eaten/drank. Any cures? I hate it. Even after scraping my tongue it's never fully gone, just slightly less prevalent, and then throughout the day it'll accumulate again. I have good dental hygiene and I floss daily. Please help!