I'm an ayurvedic practitioner, and can tell you what it means in ayurveda if you like. White stripe down the middle means toxins in the digestive tract. Not sure how far it starts or ends from your description, but back of the tongue is colon, middle small intestine, front is stomach. sides of the tongue red and inflammed means malabsorption and inflammation in the small intestine, liver and gallbladder. tip of tongue is heart...or high systemic heat. basically, your tongue says you've got some inflammation and toxins in your digestion.
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