Tongue, cheeks and roof of mouth extremely sore from rough edges. Is this normal and how long will it last? What can be done?

I started SDc treatment on Friday night with my first tray (of 16). I expected the pain from the pressure on the teeth and that part is getting better, but what is not is the soreness on my tongue and gums from the edges of the aligneras being so sharp. It cuts into my tongue and cheeks in several places and hurts really badly. I have tried to smooth the edges but it's still painful. Is this normal? I had braces when I was younger and it is as painful as when I had braces.

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