it depends on what look you want really. the first time i paid for 1ml and had 0.7mls in the top and 0.3 in the bottom lip.
the second time i paid for 0.5mls i had 0.4 in the top and 0.1 in the bottom and the 3rd time i just had 0.5 in the top.
the dental block is like you have in the dentist b4 having ur teeth out, to be honest i wouldnt reccomend it i managed just fine without it and i found it hard to eat or drink afterwards.
i think the side effects are swelling, lobsidedness etc. mine were a bit uneven the 2nd time but they settle nicely with a bit of massage.
im hoping to have mine done again at xmas x