A slight dent in your nose is a contour problem; nasal valve collapse is a functional problem which is usually dynamic. Slight dents in the contour of the nose are treated quite differently than a nasal valve collapse. See your surgeon and have an assessment of your situation.
In medicine there is no always nor ever or never.A "slight dent" on the nasal bridge may be the result of several reasons including but not limited to:Scar formation ,overzealous cartilage resection ,internal valve collapse, skin lesions etc.