Anyway, after he injected the pain killer stuff, I started getting really jittery. Kinda like I was on way more coffee than is good for me. I told the assistant just because my mouth wasn't full of hands yet and I had to get some talking out. I found out that they use epinephrine in the painkiller stuff. Some of it got into my blood stream and made my heart race. The reason for this is that epinephrine shrinks that blood vessels to keep the drugs localized longer for effectiveness. Isn't that smart? I was impressed. Shortly after that, the dam was placed in my mouth and with it they lost their opportunity to teach me.