double. Or plus one?

I really really suck at my part-part-part-time job.

I am never punctual.
I am never consistent.
I am never remembering.

Being a "Tooth Fairy" is tough!!

My daughter has lost 5 teeth in three weeks.  Who does that?  And what does she have -- "Super Teeth"?  Or is it just a test of the reality of the "Tooth Fairy"?

OK, I know, being a "Tooth Fairy" is not difficult.  Actually, it's quite easy.  You wait until the newly detoothed child is asleep.  You slip into their room.  You grab the tooth.  And replace it with the monetary gift of choice. 

So, HOW can I possibly mess this job up ... each and every time??

1.  Totally forgot about the tooth.  Even though it was pulled at the Dentist office less than 6 hours ago. 

2.  The tooth fairy forgot again.  Tooth Fairy slipped money under pillow during breakfast.

3.  Tooth Fairy went to bed and never woke up ... until she heard the "SHE FORGOT AGAIN" scream at 6 o'clock in the morning.  Tooth fairy came the next evening.

4.  Tooth Fairy remembered the MONEY.  But she forgot to take the tooth.

5.  Tooth Fairy took the tooth but forgot the money!  She needs to revisit.

In our house, we have a tooth fairy rule that was established at the very beginning... 5 years ago.  "IF the TOOTH FAIRY doesn't come, then she brings DOUBLE the next night."  

So that brings us to the fifth tooth...
And that brings me to my question:
If the detoothed child receives one dollar, and the tooth fairy forgets one night, then the following night she brings two dollars.  But what is the amount to be received if the tooth fairy forgets to visit on the second night?  Does she double the two dollars, now making four dollars for the third night?  Or does she just add one dollar, making three dollars for the third night?  I know how to double.  But does an eight year old? 

Let's vote:
A.  Four Dollars    or      B.  Three Dollars

I now propose a toast to all past, present, and future "Tooth Fairies".    Because being a tooth fairy is tough!
And financially draining, in my situation!