| http://www.w3.org/ns/prov#value | - Throat inserts and their appendages are usually made of hard material, such as metal or hard plastic, and, since it is necessary to apply considerable force to an insert for inserting it into a throat passage, and such an insert may buckle in the mouth during such insertion, it is not uncommon for a hard portion of throat insert apparatus to engage or strike one or more teeth sharply, particularly
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