Dentist Vs Orthodontist?

I've already paid for the treatment and had my impressions taken, the dentist hasn't received the trays yet though. After doing some Googling (a little late) I keep reading that an orthodontist is preferred as opposed to seeing a dentist as they are more qualified. Now I'm worried that I won't achieve the results I was hoping for because I'm going through a dentist. Is there really a substantial difference in the outcome?

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