I had my wisdom teeth extracted about 5 days ago, the stitches on one broke. Do I need to get it restitched? There's no blood.

There is no need. If the area is clean and tissues are healing there is no need to have re sutured after the 5th day , there is no blood because the socket is healing..
You should be fine. Best to exercise caution and good oral hygiene. If you are concerned contact your dentist or oral surgeon for advise. Hope this helps.
Normally not a prob. The sutures (stitches) normally placed these day are dissoluble and end up coming out on their own. If there is pain, discomfort, or swelling, i would call the office asap.