Narrow palate/upper arch?

[Seaunicorn]

Hello!

I’m trying to figure out if my palate/upper arch is a bit narrow. I have some problems that I think could be related to a narrow/upper arch for example: I do not get enough air when breathing through my nose (and therefore I often have my mouth open, especially when I sleep, I have a crossbite on one side (only the teeth at the back of my mouth) . Most of my teeth fit together ok but some of the teeth in the upper arch is slightly flared outwards and some of the teeth in my lower arch lean inwards slightly. What confuses me is that when I compare a picture of my upper arch with others it doesn’t look very narrow. I will try to post a picture!

[Seaunicorn]

Turns out I’m no new to post pictures.. by the way I forgot to mention that my tongue feels a bit “misplaced” it’s like there’s not enough room for it in the upper arch. And the lower arch is also a bit narrow since the teeth leans inwards slightly (I guess that they are positioned like that to fit inside the upper teeth).

[Seaunicorn]

Does anyone know how narrow the arch should be to do SARPE? I’ve only seen it used on extreme cases.