Help with bad breath

Feels like my life is hell now...I so wanted to have a nice conversation with my friends , but the bad breath stopped me from doing so , it's all because of my coated tongue that my breath is bad because I went to the dentist also but he said that my teeth are okay , and I don't have any digestion problem also , so it's the coated tongue because whenever I clean the tongue with a tongue cleaner the breath becomes fresh but after 5-10 mins it's coated again and my mouth starts stinking again...I'm just so depressed as I cannot talk with anyone , especially in school where u have a lot to discuss...please suggest a medicine to get rid of the coated tongue ...please help ...please my exams are also coming and I'm not being able to stop thinking of my bad breath because it's affecting every part of my life. ..please help!!!!...
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