Can someone explain this joke as I don't get it please? Can mouth mean a person in Irish slang?

Murphy went to the dentist last week. The dentist said to him "Well, how is the mouth?" Murphy said, "Shes sick in bed." or:Murphy went to the dentist

Murphy went to the dentist last week.
The dentist said to him "Well, how is the mouth?"
Murphy said, "She's sick in bed."

or:Murphy went to the dentist last week. The dentist said to him \"Well, how is the mouth?\" Murphy said, \"She's sick in bed.\"


or:I'm guessing that Murphy objectifies his lady, as if only her mouth is of value to him.


or:It's referring to the fact that 'all women do is talk' in this case it's most likely his wife/girlfriend. Because she nags/complains/never stops talking he is calling her 'the mouth'.

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