My 4-year-old hasn't stopped talking about the dental hygienist

This has been going on for 3 weeks. Every single day he brings it up unprompted. "Mom, remember when the lady cleaned my teeth?" "Dad, do YOU go to the dental hygienist?" I genuinely don't understand what happened but apparently it was the best day of his life. Last week he told my wife he wants to BE a dental hygienist when he grows up. It's hilarious but also mildly concerning that the bar for excitement is this low lol