Is it possible for braces to not help me? Was told veneers are my best option. Is there any other advice? Thank you. (photo)

I had a dentist appointment today and was told braces would not help me. I have several spaces and need 3 fillings. The example used was that of a small car trying to fit into a large parking lot. I interpret that as being my mouth is too large. The dentist advised that braces to fix my front gaps would cause the gaps to arrive in other places or interfere with my bite in the back.

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