Bermudagrass is green only at the top. If you allow too much time to pass between mowings you end up cutting off the green top back down into the brown interior. The more often you mow the better it will look after you mow and the denser the lawn will grow to be. The idea is to cut no more than 1/3 off of the grass height at each mowing. Thus the shorter you keep your lawn the more often you will need to mow since it will not be able to grow much before it is time to mow again. Regular mowing and moderate fertilizing will also help keep your back lawn dense and attractive. I don't think adding seed will be necessary or helpful.
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