Clockwise rubbing is the best way to tighten the roots of dreads.

How to do it:

• grab the dread.
• rub the dread in a clockwise motion against your scalp.
• you can put a rubberband around the root after you are finished to hold the new knots together, make sure the rubberband isn’t to tight just snug.

If you would like to see a video tutorial on how to clockwise rub dreadlocks this page has great information.