Aging kits reliably
 
http://listserv.cuny.edu/Scripts/wa.exe?A2=ind0004&L=FERRET-
SEARCH&P=R23903
 
It is mine so I can quote a large section without violating copyright, so
here you are:
 
>Okay, let's be wild and let 6 weeks equal 42 days, 7 weeks equal 49
>days, 8 weeks equal 56 days, 9 weeks equal 63 days, 10 weeks equal
>70 days, and 11 weeks equal 77 days. You get the picture. Now,
>compare that with the below table of typical eruption times for
>ferret teeth:
 
>Upper:
 
>***50 days*** (just over 7 weeks): Canine -- the conical shaped tooth
>***53 days*** (7 and 1/2 weeks): Molar 1 -- the tooth at the back
>               which has a bit of  flatness to it
>***60 days*** (8 and 1/2 weeks): Premolars 2-4 -- the slicing teeth
>               at the sides of the mouth
 
>Lower:
>***50 days*** (just over 7 weeks): Canine and Molar 1
>*** 60 days*** (8 and 1/2 weeks): Premolar 2
>***67 days*** (9 and 1/2 weeks): Premolar 3
>***74 days*** (10 and 1/2 weeks): Premolar 4 and Molar 2
 
>So, the adult teeth typically come in at JUST OVER 7 (SEVEN) WEEKS
>of age (or one month and three weeks) through TO ALMOST 11 (ELEVEN)
>WEEKS of age (or two months and three weeks).  This is well
>documented and in veterinary texts (which is what my source is).
[Posted in FML issue 4876]