ascended 2nd molar

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i have noticed this since 1 month. my right second molar below has ascended a little bit and it causes pain when i grind food. i have 32 teeth all in all without (any) impacted. up and down at both ends, i got my third molars complete at the age of 15 or 16. my dentist said, third molars must be extracted to avoid over-lapping and mis-allignment. shall i go for this extraction? is it hurt? shall i file for a vacation in the office so i could rest? i have never been into any surgical operation whether major or minor and i am afraid a little bit.. lol. will my dentist include pulling out my second molar as it ascended a little bit and i can feel the pain when i grind food?