When seeking volume, what tool should be used at the root during blow drying?

When seeking volume during blow drying, a brush should be used at the root. Using a brush allows you to lift the roots while drying, creating volume and lift at the base of the hair. A comb may not be as effective in creating volume because it does not provide the same level of lift and tension as a brush. A flat iron and a curling iron are not typically used to create volume during blow drying; they are tools more commonly used for straightening or curling the hair, not for adding volume at the root.