I'm a menace, a dentist, an oral hygienist
Open your mouth for about four or five minutes
Take a little bit of this fluoride rin-inse
Swish but don't spit it, swallow it now finish

Meaning

Eminem is telling this girl to give him head and swallow his load

Mentions menace and then dentist which is a reference to Dennis The Menace a mischievous little son of a bitch just like Slim Shady.

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