Its much healthier to breath through your nose because your nose hairs will help to clean the air before it goes to your lungs. If you breath through your mouth it won't be as clean since there is no hairs.
That being said, both for me.

Nintendo still doomed?
Feel free to add me on 3DS or Switch! (PM me if you do ^-^)
Nintendo ID: Mako91 3DS code: 4167-4543-6089







