Yes, that's to be expected.
He's an old man who's been isolated for years and practices terrible personal and dental hygiene.
He's finally gotten to the point that his lower rear molars have cracked. This interferes with the auditory nerve and distorts ordinary noises.
Mine broke during a septic episode caused by antibiotics. My jaws were clenched for weeks.
My air conditioner whispered to me.
The windshield wipers in my car made siren sounds.
The blinker noise was unbearable.
My teeth never hurt.
Yeah, he needs a dentist to examine his head, thank you very much.
On that theme: