Dental hygiene in plants??? Now that was one thing his mum hadn't talked to him about! Seriously, he reallllly hoped they weren't going to learn how to brush a plants teeth properly. Now that would be just plain weird!!! Ok, hmmm what could dental hygiene help plants with. Why would they need to have teeth in the first place. Well, the obvious answer would be to take bites from whatever it was it was eating. But what else...

Raising his hand he waited to be called on "Maybe to call their food to them by whistling pretty music? If there's food in their teeth it wouldn't sound right when whistling."