I really only know of 2 options while your actually in the process and that's the laughing gas or the needle in your gums. I guess the needle is filled with novacaine.
The needle worked best for me because when I got home my mouth was just really numb. I've had the gas too when I was younger but it only sedates you while their doing the procedure but the needle takes a while to wear off. Most dentist give you a choice.
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