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A normal square root is already , we just dont write that for simplicity, so if you do it twice the root changes.
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![\sqrt[4]{b}](https://img.qammunity.org/2023/formulas/english/high-school/as74yhrjuvlt1x0z5pqo4zzgalsnw2ympa.png)
.![\sqrt[2]{b}](https://img.qammunity.org/2023/formulas/english/high-school/sg6308jtako9lfp9fl506sv2vu5hd5gm4c.png)
, we just dont write that for simplicity, so if you do it twice the root changes.