In September 1931 the Weekend Review pointed out the “regrettable omission of any reference to tooth-brushing in the description of Adam and Eve retiring for the night” in Book IV of Paradise Lost. It challenged its readers to improve Milton’s text; polymath Edward Marsh inserted these lines:

[… and eas’d the putting off
These troublesome disguises which wee wear,]
Yet pretermitted not the strait Command,
Eternal, indispensable, to off-cleanse
From their white elephantin Teeth the stains
Left by those tastie Pulps that late they chewd
At supper. First from a salubrious Fount
Our general Mother, stooping, the pure Lymph
Insorb’d, which, mingl’d with tart juices prest
From pungent Herbs, on sprigs of Myrtle smeard,
(Then were not Brushes) scrub’d gumms more impearl’d
Than when young Telephus with Lydia strove
In mutual bite of Shoulder and ruddy Lip.
This done (by Adam too no less) the pair
[Straight side by side were laid …]

Marsh called this “the cleverest thing I ever did.” “The mordacious Telephus and Lydia are ‘of course,’ as the gossip-writers would say, from Horace, Odes, I, xiii. Martin Armstrong, who had set the competition, gave me the first prize, and was good enough to express the hope that future editors of Milton would put my lines in the appropriate place.”

(From Marsh’s 1939 memoir A Number of People.)