sweet tooth

noun
a liking or craving for candy and other sweets.

Origin:
1350–1400; Middle English

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Based on the Random House Dictionary, © Random House, Inc. 2014.
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Collins
World English Dictionary
sweet tooth
 
n
a strong liking for sweet foods

Collins English Dictionary - Complete & Unabridged 10th Edition
2009 © William Collins Sons & Co. Ltd. 1979, 1986 © HarperCollins
Publishers 1998, 2000, 2003, 2005, 2006, 2007, 2009
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Etymonline
Word Origin & History

sweet tooth
"fondness for sugary stuff," late 14c., from sweet (adj.) + tooth in the sense of "taste, liking" (see toothsome under tooth).
Online Etymology Dictionary, © 2010 Douglas Harper
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American Heritage
Idioms & Phrases

sweet tooth

A love for sugary foods, as in You can always please Nell with cake or ice cream; she has a big sweet tooth. This expression dates from the late 1300s, although it then referred not only to sweets but other delicacies as well.

The American Heritage® Dictionary of Idioms by Christine Ammer.
Copyright © 1997. Published by Houghton Mifflin.
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Example sentences
Rabbits have a tendency for a sweet tooth and, given the opportunity, will eat
  only sweets and not hay or greens.
And it turns out that kids with a sweet tooth see themselves as sweet.
His curiosity gets him into all kinds of trouble, and his sweet tooth puts his
  life in danger more than once.
The sweet confections from these bakeries have put them on the map, and
  indulging in one of them will satisfy your sweet tooth.
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