Why we feel cold when we put ice cream in our mouth?

Dear student,
We know that heat always flows from a hot body to a cold body until the quantity of heat is the same in both the bodies.
Now, ice-cream is colder than our mouth and body temperature. So, heat is transferred from our body to the ice cream to raise its temperature. 
Thus eventually our body temperature decreases and we feel cold.
Regards
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Because temp of our tongue is almost 98deg fahrenheit ie much hotter than temp of ice cream (almost 0Deg) so , icecream takes heat from tongue for melting, . That why it feels cold when putting icecream in mouth
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