I have triangular elastics for my braces. What are they for? To move my jaw forward?

[Solgaᛏᛅᛋ]

I have the one called "Impala"

 

[NOCTURNALDEATH]

I have the one called "Impala"

So moving your jaw forward and also making sure your teeth are aligning correctly with the treatment of your teeth alignment. Theyre gonna hurt due to the movement snd soreness will be present for a bit, but trust the process. Most likely your ortho took scans and created a game plan for the repositioning of your teeth, so the elastic will have its own strength to ensure theyre guiding the teeth and jaw correctly