Probably the same way we can know things like if you break a glass, it’s gonna stay broken. Or if you cut off a finger that it stays cut off.
Probably seen telomere damage from radiation or some such. Some sort of thing which doesn’t grow back naturally. So sans technology that will change our biology, we know some things are permanent.
Although like 20 years ago I could’ve used a tooth falling off as an example, but I first read about tooth regrowing studies in a science mag in the early 00’s and 20 years later we’re kinda there actually. The researchers hope to have it for general use by 2030. A tooth regrowing drug! Phase-1 human trials already concluded without adverse effects.
Probably the same way we can know things like if you break a glass, it’s gonna stay broken. Or if you cut off a finger that it stays cut off.
Probably seen telomere damage from radiation or some such. Some sort of thing which doesn’t grow back naturally. So sans technology that will change our biology, we know some things are permanent.
Although like 20 years ago I could’ve used a tooth falling off as an example, but I first read about tooth regrowing studies in a science mag in the early 00’s and 20 years later we’re kinda there actually. The researchers hope to have it for general use by 2030. A tooth regrowing drug! Phase-1 human trials already concluded without adverse effects.
https://dentistry.co.uk/2026/06/09/tooth-regrowth-in-adults-what-we-know-so-far/