As for eating, there is no problem. Although the temperature of liquid nitrogen is extremely low (-196℃), at room temperature (regarded as 25℃), such a low temperature cannot exist for a long time. As soon as the biscuit is taken out of liquid nitrogen, it will quickly heat up, and the lowest temperature in the mouth will be MINUS 10 degrees, and it will not be frostbitten.
When CPU overclocked with liquid nitrogen, only one shot of liquid nitrogen can cool it to a few degrees below zero. So liquid nitrogen is not as powerful as you think ~