2--It's such a chore.
 
1--Brush, brush. Spit, spit.
 
2--What did they do in the old days?
 
1--They brushed with their fingers.
 
2--They also ate with their fingers!
 
1--Why do they call it the good old days?
 
2--Maybe because they didn't have to brush and floss.
 
1--Who invented flossing?
 
2--A dentist, I'm sure.
 
1--I hate flossing more than brushing!
 
2--I can't wait till all my teeth fall out.
 
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注解：
 
1.chore令人厌烦的任务  
2.flossing牙线   
3.dentist牙医 

===================================
译文：

1--我讨厌刷牙。
2--它是讨厌的事。
1--刷，刷。吐，吐。
2--人们在过去是怎么做的？
1--他们用手指刷牙。
2--他们也用手吃饭。
1--为什么他们称那时为过去的美好时光呢？
2--或许因为他们不用刷牙也不用牙线。
1--谁发明了牙线？
2--我敢肯定是牙医。
1--我讨厌牙线比刷牙更甚！
2--在我的牙齿掉光之前我不能再等了。