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The incisors are used to tear whereas the molars are used to crush.
To tear and crush food
One way to get over and forget some you love is to fall in love with some else.
Just crush it into a ball, but be delicate enough not to tear or rip the paper. Un-ball it, and tada.
You have to crack or crush the shell and then tear it open to release the seed. Some people do this by biting the shell.