Apparently the theory is that most puppy K-9's will not fall out on their own and if left in will throw off the placement of the adult k-9's when they errupt.
 
Has anyone else heard of this?[/QUOTE] 
In most instances this is not the case,  I have left K-9s in on quite a few dogs and never had a problem with the bites.  
If you want to remove it but are hesitant about putting them under, try this:
Run your thumb nail down in between the 2 K-9s putting pressure on the back K-9 which is the baby tooth. Move in the same direct in which the tooth is growing. (Easier to show then to describe!!!) Do this several times a day.  This will help loosen the tooth so that it will fall out on its own. 
Best of luck.
Charlie 
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