Castile soap is the kind preferred when nicety is particularly desired. This is used by some people to clean their teeth. It is an ingredient, also, in some purgative pills, and is commonly employed for laxative suppositories, and to make warm suds for opening injections.

A lather of soap, made as for shaving, and applied with a shaving-brush, is one of the most relieving applications for itching; for example, in poison-vine eruption, or other affections of the skin.