however, that’s no reason not to plan ahead, particularly when it comes to orthodontic treatment. i feel the same way with books too. students usually spend anywhere between $100-$500 on their kits to start off with. the process of moving from where you are to where you want to be is always a journey. instead of going down the rabbit hole of creating new types for every possible interaction, we can use the most general thing we have: data and functions. 