Yeah that looks like a smoothing group issue just select all the polygons (faces) in the editable poly and goto the "Polygon: Smoothing Groups" rollout (I'm assuming that your'e using editable poly) and select the "clear all" button then select the "1" button, this will make all the polys selected turn to 'smoothing group 1', if all polys are selected then all polys are made seamless.
An alternate possible fix is to select all the vertexes and weld them together with a very small "Weld Threshold" (something like 0.01 or even 0.001). smoothing group issue is more likely try that first.
If this doesn't fix the problem then post more info about the model, for example "how did you model it? is it imported, if so, from what program?"
Hope this helps
