On a related note, I used to wear retainers (top and bottom. total nerd? yes). I noticed that when I wore them my voice sounded higher. Well, when I started using higher end pitch shift and vocal transform effects I figured out why.
When we speak our mouths act as one of a few resonant chambers (chest, nasal passage, and throat are among the others). When I wore the retainers they would effectively make the space in my mouth smaller causeing a higher resonance frequency without actually effecting the pitch. This is akin to a formant shift available in most pitch shifting effects.
Based on this obsevation I would say that dental stuff can in fact effect timbre of the voice as well as pronunciation. The amount of wich could be entirely negligible.
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