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AnnDriena_ said:
Is it better for them to use the brush and then use the dryer up and down the hair shaft than just using a comb attachment, I know it can get it straighter because of the tension but is it healthier for hair than regular blowdrying.
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The comb attachment will not give the sleek look that most desire. A round, boars-hair bristle brush gives the best results. I think that it's best to blow only the roots, as not to put too much tension, strain on the hair. This is particularly important for longer hair. This also helps to maintain the ends of the hair, by not applying too much heat to them.
If the hair is properly wrapped, you should have a great amount of body and sheen.
ETA: the temp of the heat is going to be the same regardless to whether or not you use a brush or a comb. So, you may as well use a brush to acheive the desired straightness. Otherwise, you may end up passing the dryer over the hair more times by using the comb.