I found another way to do this. Thanks to this site. It mentioned that the former method is just to test out the frontier part of the tongue.. For back of the tongue, it might be the actual smell is.. To get this, you need to scrap the whitish stuff behind the tongue with a spoon and smell it yourself..
Ya.. Sometimes, it is just like body smell. It is quite an embarrassing thing. When you yourself immune to the smell. They even have the gadget like Halimeter and Seju Kiss Me Meter to test your bad breath without victimizing people that inhale your breath.
Halimeter - what a bulky stuff..
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