[hanniabu]

Probably not since you'd be drooling all over the robot "hand" and arm making it more difficult to keep clean.

But it could probably moisten your drying out lips so they don't crack

[matt_heimer]

All reusable dental tools have to go through a sterilization procedure after every use so would it matter? And they could have one-time use sleeves to put on the arms.

I think the main concern would be debris and drool getting on the camera but that is probably a concern for any position.

[eru]

And you can just put some glass over the camera, and have a little wiper or 'lotus effect' coating.