De civilitate morum puerilium libellus

Hawking.

...and they belch at every third word; a thing which, if it turns into a habit from tender years, sticks even into older age. The same should be thought about hawking original: "screatu", by which names the servant in Terence's the play Adelphi is noted by Clitipho. If a cough presses you, take care that you do not cough into anyone’s face, and let there be an absence of the ineptitude of coughing more loudly than nature demands.
Vomiting.

If you are about to vomit, withdraw: for it is not shameful to vomit, but it is deformed to have invited vomiting by gluttony.
Care of the teeth.

The cleanliness of the teeth must be cared for, but to whiten them with powder is for girls; to scrub them with salt or alum is destructive to the gums: to do the same with urine is for the vulgar. If anything has stuck in the teeth, it must not be removed with a knife, nor with the fingernails, in the manner of dogs or cats, nor with a napkin, but with the tip of a mastic twig, or a quill, or small bones taken from the legs of roosters or hens.
The mouth.

To rinse the mouth with pure water in the morning is both urban and healthy; to do it repeatedly is inept. We will speak of the use of the tongue in its own place.
Things concerning the head.

It is rustic to have uncombed hair. Let there be cleanliness, not girlish polish. Let there be an absence of the filth of lice and vermin. From time to time...