Wisdom tooth removal more than 1 week ago. since yesterday, the site started to bleed heavily when i brush my teeth, then it stops few minutes later. no pain, no swelling, no bad taste in the mouth. is it normal? what to do to make it stop bleeding?

You may be traumatizing the immature tissue when brushing. Stay away from that area for another week or two and let the wound heal.

A moist Lipton black teabag can be placed in the area as the tannins induce clotting. Stay away from the area for now and return to the dentist if the problem does not resolve.

You may have traumatized the surgical sites. Use soft t'brush, not medium or hard. Brush gently but thoroughly, avoiding the surgical sites entirely for about 2 weeks. Floss daily, but avoid surgical sites for 2 weeks. If that doesn't help, your Dentist or Oral Surgeon (whichever did the surgery) is responsible for your post-surgical care. Call him/her.