Aggregated diamond nanorods, or hyperdiamonds, if you wanna sound cool, these are the hardest, most dense, and least compressible material we know of.

聚合金刚石纳米棒，或超级金刚石，更酷的是，这些是我们所知的最坚硬、密度最高，几乎无法压缩的材料。

But after those adult teeth grow in, all the stem cells that laid down the crystal nanorods self-destruct, so that's the only set of replacement teeth you get.

但当这些恒牙长出后，所有生成纳米结晶体的干细胞就会自我消亡，所以你只能有这一副替换牙。