Namah shivai , everyone, first of all i thanks all of you for giving so much information about this mudra, i need to ask a question , i have heard that during practicing kechari mudra practice , a person should not eat or drink sour and salt , it make lose of elasticity of tongue …is it true…or if it not please suggest me what should not be eaten… 
We all experienced some frustration, for me it’s been just a couple months since i’m able to perform Kechari mudra.
I took me two years, no fingers, no snipping, just talabya, and some “invented by me” frenum stretching procedures.
As some said, it is actually a process rather than a purely mechanic thing.
I had my frenum long enough for at least 7 months, but something wasn’t allowing my entrance to the cavity. At last
one day the door finally opened …
I insist that those of us who can do the mudra should get ourselves an MRI (ala Shailendra Sharma), so as to clarify
where the tongue goes!
Blessing to everyone
Namah shivai, good idea of MRI , it should be done in order to see where it is…