What is the plural of tooth?

What is the plural of tooth?

The plural form of tooth

The plural of an tooth is

teeth
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Why is the complex number of radio radios instead of radios
Piano → pianos instead of pianoes
Photo → photos instead of photos
I know it's an exception, but can anyone tell me why? Do you have to remember?

The general saying is: living (including animals and plants) followed by - es, inanimate plus - S
Piano, photo, radio have no life, then add - S
If there is life in tomato, potato, mosquito, hero, then add - es
If the volcano is dead or alive, add - S / - es
*If you have something special, just remember it