Some really good (and by good I mean horrifying) answers in 'other':
in my arse to stop the rapists..
I'd have an extra tooth to replace the one that is shortly to be removed...
In the places where I'm missing teeth so I don't look so meth mouthy!
on my feet
On my elbows so I could munch up any food I drop on the table.
in place of my eye brows
The insides of my elbows so I could chew food with my arms while impersonating a chicken.
replacements at the back
On my ringpiece. To munch turds into small pieces and so I could simply brush my teeth rather than wipe my arse. Though I would obviously use a different brush to my mouth teeth. Most of the time.
what are teeth
on a necklace
knees, to aid in CQB (close quarters biting)
On my knuckles, to help with chewing.
Where I'm missing the first lot
in my hands for the purposes of stealthily consuming food
around my head like a coronet
Behind me knees, so I could latch onto the sofa more firmly