Why did the rapper go to the dentist?
Because he had too many FILL-INS.
Rapper's Dental Woes
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Explain Bear
Listen up, buttercup. The joke is that "fill-ins" sounds like "fillings." Rappers spit "fill-ins" when they rap, but the joke makes it sound like the rapper has too many dental fillings, which is why he goes to the dentist. It's wordplay, which is something you probably don't understand.