There was no hype at all about the white plastic they put in your teeth instead of gold or amalgam. There was no hype about bullet trains, they just happened.
Hype happens when people don't really need a product and the marketing machine has to compensate. It helps if the product seems like magic for the first month and then becomes obnoxious and boring without marketing.
The NHS largely prefers amalgam over white fillings for the simple reason that there is consistent but low quality evidence that they last longer (1) and are lower cost. There absolutely is hype in dentistry, and it's very dangerous as most procedures are irreversible.
Hype happens when people don't really need a product and the marketing machine has to compensate. It helps if the product seems like magic for the first month and then becomes obnoxious and boring without marketing.