Is this normal?

I have healthy teeth, healthy gums and good mouth hygiëne says my dentist, I take good care of my teeth and mouth. I brush my teeth 3 times a day for about 10 min, after that I brush my tongue with toothpaste and the roof and corners of my mouth, floss my teeth and rinse it with Listerine mouth wash. After that I... show more I have healthy teeth, healthy gums and good mouth hygiëne says my dentist, I take good care of my teeth and mouth. I brush my teeth 3 times a day for about 10 min, after that I brush my tongue with toothpaste and the roof and corners of my mouth, floss my teeth and rinse it with Listerine mouth wash. After that I have a fresh and clean breath but after a few hours it goes away unfortunately and I get that not so nice breath again. I was wondering is this normal? And why doesnt breath stay nice for so long? Has anyone else here the same problem? (No I dont have tonsil stones in my throat that cause bad breath in case you wondered)
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