Oh... this is back? I didn't notice.
GRAPHICS: Alright, I know some people are just naturally more artistically talented than others, but that doesn't mean you can't improve on what you have here. I'm not saying everyone can be an Adam Phillips or a James Farr. I'm just saying that if you actually try and practice... you inevitably WILL get better. I realize that they are TeeF in a mouth. They don't have any limbs. But you could try drawing more custom eye and mouth shapes instead of using the same generic ones over and over. Or SOMETHING to not make everything look so static and bland.
HUMOR:
This is where you have the chance to save yourself if you're not stellar in the graphics department. However... I didn't think it was that funny... at all. I think this series would be SO much better if it actually had jokes that related to them being TeeF in a mouth. What happens when the guy eats? Chews gum? Goes to the dentist? Something I've always wondered is... who's mouth are they even IN? You should definitely make him a character, and the things he does could effect what happens to the TeeF, and vice versa. That would be sweet!
The idea has so much potential I don't know why you waste it by setting your sights so low.
I also noticed you got rid of the commentaries. Personally, I thought those were the funniest part.