skin of teeth

e·nam·el cu·ti·cle

the primary enamel cuticle, consisting of two extremely thin layers (the inner one clear and structureless, the outer cellular), covering the entire crown of newly erupted teeth and subsequently abraded by mastication; it is evident microscopically as an amorphous material between the attachment epithelium and the tooth.

skin of teeth

Anatomy
Primary enamel cuticle (see there); cuticula dentis (enameli) [NH3].

Vox populi 
A colloquial phrase for having “barely” done something; as in, to have made the flight by the skin of one’s teeth.

e·nam·el cu·ti·cle

(ĕ-namĕl kyūti-kĕl)
Primary enamel cuticle, consisting of two extremely thin layers (the inner clear and structureless, the outer cellular), covering entire crown of newly erupted teeth and subsequently abraded by mastication; evident microscopically as an amorphous material between the attachment epithelium and the tooth.
Synonym(s): adamantine membrane, cuticula dentis, dental cuticle, membrana adamantina, primary cuticle, skin of teeth.
References in periodicals archive ?
Adiemus just scraped into the race by the skin of teeth and a minus against him is the fact that Shane Kelly is likely to put up 2lb over weight on last year's heavily-backed runner-up.