The main issue with accidentally melting plastic is that it gives of fumes when heated. These fumes aren't very good for your health, and will probably also impart a taste to anything you cook in the oven.
The best way forward might be to gradually rewarm the oven ( keeping the kitchen window open to ventilate any fumes), and as soon as the plastic has become softened, try and scrape off as much as possible with something like a metal pallete knife (one which you won't mind binning afterwards).
You may want to consider investing in a silicone oven liner in future.
Yes, melted plastic can hurt you. The primary danger is from a burn. Melted plastic is hot, and it tends to stick to skin and clothing. It is exceptionally dangerous stuff in that regard.
it really cant hurt you.
if they are attached to your bottom jaw, then its because they are moving your whole jaw back so it cant go as far as it could before, or because the back of the braces is anchored to your teeth.
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no its just air it cant hurt you :p
yeah bottom hurt more....
it cant...................
it can hurt the environment
you get melted by a fat guy
a
you cant but I wish you can
He cannot get hurt at all.