Hello Everyone! I just got my first yorkie pup, a pretty little 8 wk girl named Cairo

I am doing all of her grooming myself so far (I have practiced on my friends 3 yorkies) but i don't know anything about removing the inner ear hair. Is this necessary for their health, or is it only for looks? And does it hurt them? I have also read about powder to use when removing the hair. Any info is appreciated