He says:
Once upon a time our lives were longer than there were words.
You might have seventy years and fifty words  
And so by age fifty you would've said all of them. 
There would be nothing left but silence. 
For some this would be a boon; 
They would have their words, and repeat them. 
But for many it was intolerable. The people sought relief. 
Books were invented and were distributed among us.
So why don't you want me to clean your teeth?

She says:
The pain is in the monotony of repetition.

He says:
But every tooth is different and can be 
registered uniquely every time.

She says: 
Sure, if you're awake.
But so much of our time is spent in dreams.
An old dream, repeating, of my teeth falling out.
Not that they actually do but my mouth holds
a crescent of pain, emanating outward, in
purple, representing the fear of the dream.
The crescent leaks out into everyday life.
Like a phantom limb, hovering.
Any toothbrush must move through the crescent.
Pain is not in the body but surrounds the body.
Like a theremin when you get too close.
All the body does is pick up what's already there.
The mud blocks these signals.

He says:
The speech act is divided into three parts.
One is forming the intention to make the sound.
One is making the sound itself.
One is continuing to act in accordance with the sound.
Each of these can go wrong.
If one does not form the intention correctly,
sound can still be produced, but it will be
at the whims of whatever speech one has already heard.
This may fail to lead to right action.
If one does not make the sound, one will not be heard.
This is the simplest form of failure.
Caution should be taken in developing one's intention
before one has the ability to speak.
Ideally they should grow together.
If one does not act in accordance with the sound,
that makes the sound meaningless and 
does not further what little culture we have.

She says:
I disagree.
As in, yes, those are three necessary parts,
but if all three are done correctly it can still go wrong.
For instance, RRRRRRR.
There was an intent to make the sound, one.
The sound was successfully made, two.
I continue to hurt in accordance with the sound, three.
But it is not accepted as valid.
I cannot say RRRRRR when playing Scrabble.
And if I persist in using it,
people will think I'm unwell.
Which would be fine if they'd use my words for it.
But one mistakes the dictionary for real life,
if that's the only book you have.