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I've found this kanji during Shodo practice. My teacher (Japanese) didn't know
the meaning (she recognized the Tooth bushu/radical but not the "word").

I tried to look it up on the electronic dictionaries I own, both Japanese and
Chinese, but while the kanji exists and even has a phonetic associated to it:

![From Tangorin.com](https://i.stack.imgur.com/OOWlO.jpg)

there is no actual meaning.

Finally I got something from a [Chinese online
dictionary](http://www.zdic.net/zd/zi/ZdicE9ZdicBDZdic93.htm). Allegedly (I
used Google translate on the whole page) it is an old ideogram for "Milk
Teeth".

Now the question(s):

  * Does this mean anything in Japanese? 
  * What would be the current Japanese way to indicate "Milk teeth"?
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translation kanji chinese
What does "齓" mean?
I cannot answer the first question, but deciduous/milk/baby teeth is
[乳歯]{にゅうし}.

(Just a guess, but the reading かけば sounds like かけ + 歯(with rendaku), so I
imagine it to be something like 欠け歯 but I cannot find anything to substantiate
this claim.)
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Kanjigen lists `齔{シン}` (U+9F54) together with `齓{シン}` (U+9F53), and as far as
I can tell the former is more common, though I'm not sure either are commonly
used (I think `乳歯{にゅうし}` might be much more common to mean "baby tooth").

It says it can refer to:

  1. (シンす) (verb/noun) The losing of teeth which occurs around the age of 7 or 8. Or, the teeth one has prior to having them replaced (`乳歯{にゅうし}`).
  2. (noun) A child which is aged when one loses teeth. 

It also links to a similar Kanji which means "baby teeth":
[`齠{チョウ}`](http://jisho.org/kanji/details/%E9%BD%A0) (U+9F60), though I'm not
sure that's particularly common either.

[Kanjidic also defines](http://jisho.org/kanji/details/%E9%BD%94) `齔` (U+9F54)
as "losing baby teeth"/"child" and [Unihan](http://www.unicode.org/cgi-
bin/GetUnihanData.pl?codepoint=%E9%BD%94) as "lose baby teeth and get adult
teeth".
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The character in question was originally composed of 歯 (teeth) and 巳 (child).
It represented children's teeth. This later became 齔 and 齓. 齔 is typically
preferred over 齓, so I will use it below. It has two primary meanings: 1) in
children, the replacement of old teeth with new teeth; 2) children of an age
in which they are loosing their old teeth and growing new ones.

There are several compounds:

  * 髫齔 (chōshin): a child around the age of 7 or 8
  * 齔髫 (shinchō): (in general) a child
  * 齔童 (shindō): children of an age in which they are loosing their old teeth and growing in new ones
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