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The phrase "it's no skin off my nose/teeth" is generally used to mean that something isn't much of a risk/concern. But where does it come from? Specifically with respect to teeth. What is tooth skin?

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Tooth skin! That's gums, right? ;) – Mark Beadles Apr 19 '12 at 15:06
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@MarkBeadles I'm not at liberty to lol. This is Stack Exchange: a sense of humor is considered a sin. – puk Apr 25 '12 at 4:27
Possible duplicate: english.stackexchange.com/questions/19272/… – MετάEd Aug 31 '12 at 14:17

4 Answers

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"No skin off my teeth" is not an expression in the UK. Apparently it does exist in the US where it means "no skin off my nose".

Saying "X is no skin off my nose" means that X occurring won't affect you in a positive or negative manner, the outcome will be neutral to you. The phrase is explained by phrase finder as being of boxing origin. I assume because boxers' noses are the body part most prone to damage.

As James McLeod points out "skin of my teeth" means only just or barely. This question addresses its origin.

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idioms.thefreedictionary.com/It's+no+skin+off+my+teeth. This is a saying, I've heard it used, and it's defined in a great many places on the net. – user20276 Apr 19 '12 at 11:31
@NathanC.Tresch that link takes me to "It's no skin off my nose". I guess it's just Americans who use "It's no skin off my teeth" as I've never heard it. – Matt Эллен Apr 19 '12 at 11:39
That page also discusses teeth. :) – user20276 Apr 19 '12 at 13:19
+1 for mentioning "The skin of your teeth". I think it's good to note that this is where the mixed metaphor probably came from. Interestingly, as an American, I've never heard anybody say "No skin of my teeth". It's usually "back", rather than "teeth". – KChaloux Apr 20 '12 at 16:23
Contrary to what is written above, "no skin off my teeth" is an expression used in England, or at least certainly in my part of the country (Hampshire). My parents (both from the twenties) certainly used it. – user30942 Nov 15 '12 at 13:43
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I'm from the American South, where "no skin off my teeth" is a common phrase. It may be a mixed metaphor, as others have stated; however, it makes sense in that your teeth have no skin and therefore "losing" this nonexistent skin would have no consequence--as in, you can't lose what you don't have. At least that's how I always reasoned it when I would hear the phrase as a youngster.

Looked at in that way, it actually makes more sense than "no skin off my nose." Many Southern Americans have pure British lineage. Perhaps the modern usage in Britain is the mixed metaphor, and the Southern American usage is the same as it was passed down from Colonial Americans? This is all just conjecture on my part. But think about it. It makes sense.

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Welcome, Lynne, and thanks for getting involved on EL&U. We generally want responses to deal with documented facts, or at least opinions based on experience. Plausibility and "how [you] always reasoned it ... as a youngster" don't really constitute evidence here. – Robusto Dec 11 '12 at 20:40
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The phrase "skin of my teeth" is from the Bible, Job 19:20.

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"Escape with/by the skin of my teeth" (from the Bible) is a different expression to "it's no skin off my nose/teeth" from the question but there's some commentary here. – Hugo Aug 22 '12 at 19:03
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This Ngram suggests no skin off my nose is more common and originated around 1930, and no skin off my teeth around 1940.

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Modern proverbs and proverbial sayings from 1989 gives the following:

1929 WFaulkner Sound (NY) 307: It was no skin off my back. 1932 MTurnbull Return (P) 90: 'Tain't no skin off my nose. 1933 WMarch Company K (NY) 141: It's no skin off my back-side. ...

1952 HWaugh Last Seen (NY) 87: It's no skin off my teeth whether she's alive in Michigan City or dead in Boston. 1954 HStone Man Who (NY 1957) 15: Fatso was no skin off his nose. ...

Cambridge Idioms Dictionary, 2nd ed. gives geographical usage:

It's no skin off my nose. (British, American & Australian informal) also It's no skin off my (back) teeth. (American informal)
something that you say which means you do not care about something because it will not affect you We can go in his car if he prefers. It's no skin off my nose.

No skin off my nose

The earliest "no skin off my nose" I found in Google Books is from a 1910 The Cosmopolitan: Volume 49:

... an' I'll shore have it or have war.' "'Which I harbors no notion,' the professor protests, continyooin' to be deprecatory, 'of tryin' to make it otherwise. Your romancin' 'round single that a-way ain't no skin off my nose.

And a 1910 The Saturday Evening Post: Volume 183, Issue 2:

“Of course, Max," Abe added, using his partner's metaphor, “it ain't no skin off my nose, y'understand." “Ain't it?" Max growled as he turned on Abe with a menacing glare. “Well, it's a wonder it ain't, the way you are sticking it into ...

Earlier than this, losing the skin off your nose would happen after a long, tough journey in the sun, or from the intense frost of a cold journey.

No skin off my teeth

Answers to another question here at EL&U suggest the -teeth phrase is a combination of
by the skin of one's teeth and it's no skin off my nose, as this and this. The -teeth phrase seems to have originated in the southern US. This is a mixed metaphor, and yet another variation of "no skin off my nose/back/backside".

The earliest "no skin off my teeth" I found in Google Books is from a 1938 The Atlantic monthly: Volume 162:

Cap'm,' he said, looking at the ground, 'I'ma man don't never kick in no other man's stall.' 'Well, maybe you do and maybe you don't. That ain't no skin off my teeth, and if you get killed messin' around here that won't be nothin' new. Anyhow, it ain't gonna be to-night. You been givin' me the creeps with them songs you been singin'. Now let's hear somethin' lively.

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But what about its origins in the bible? wiki.answers.com/Q/…; – puk Apr 25 '12 at 4:27
"Escape with/by the skin of my teeth" (from the Bible) is a different expression to "it's no skin off my nose/teeth" from your question but there's some commentary here. – Hugo Apr 25 '12 at 8:38
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A very good answer. It might be added that it's usually spoken with the emphasis on my, so it sometimes means "Your problem, not mine." It strikes me that there might be some seepage from "Cutting off your nose to spite your face", as well—not in the meaning so much as in the processes (beyond euphemism) which tied the phrase down to the nose rather than other parts of the body. – StoneyB Aug 22 '12 at 17:47

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