And here we get the obvious statement about this symbol. But, it is a very common thing for people to say, so I think the author can get away with being a little obvious.

we connect the moment of losing the tooth to the moment that Sonya grows up a little bit. Her losing the tooth represents her losing a little bit of her childhood.

This is reinforced by her not believing in the Tooth Fairy. We see that she has already done a little bit of growing up.

Right after this realisation - Human Cannonball is still happening.

If her losing the tooth represents her losing a bit of her childhood, then human cannonball represents the bit of childhood she still has left!

https://axminsterheritage.org/industry-commerce/

J H Shand Ltd.<br /> From 1940 until the late 1980s J H Shand Ltd employed highly-skilled engineers and technicians, designing and manufacturing steel type used in office equipment and industrial marking systems; and the manufacture of tools and equipment for use by other manufacturing companies. The company’s original role was to supply individual letter type blocks to manufacturers of manual typewriters which they could build into their machines. As electric typewriters took over, the company specialised in the manufacture of plastic ‘daisy wheels’. As well as producing raised characters for use in typewriters etc , the company made embossing type to produce raised letters or numbers when pressed into metal or plastic. This technique was used to make credit cards, many millions of which have been issued. Another side to the business made larger equipment including precision machine tools.

Archeologists and anthropologists have evidence to suggest that modern humans were responsible for the extinction of numerous species due to superior predation skills combined with lack of ecological foresight, leading to resource overshoot. This lack of ecological foresight is not a modern phenomena, but goes back to our early ancestors.