The device uses radiofrequency or ultrasound to ablate the renal nerves. The excimer laser is used to ablate the most anterior portion of the corneal stroma. Phototherapeutic keratectomy (PTK) can be used to excise or ablate the abnormal corneal tissue. HIFU for prostate cancer utilizes ultrasound to ablate/destroy the tissue of the prostate. No burning with heat or actual cutting is required to ablate the tissue. Lasers are used to cut or ablate bones and teeth in dentistry. A newer procedure uses a carbon dioxide laser to ablate the vermillion border. Meteoroids that produce meteorites ablate as they pass through the atmosphere and lose mass. Almost all meteors which fall towards Earth ablate long before reaching its surface. They both call House as the team is about to ablate the patient's marrow. These are avoided by the more radical "ablate and pace" treatment (see below).