I had already braces in 4 months and still no changing. Any suggestions? (photo)

My four months braces has no improvement. Too much worried on myself. My lowerbite is still existing. And i feel no pain at all. As you can see in the picture my case is really too bad. Crooked+underbite. My dentist said the life span of my braces is three years. Do i need to exchange my dentist? Thank you so much.

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