This Cochrane review looked at cryotherapy (ice chips) for preventing oral mucositis in patients with cancer. 14 RCTS involving 1280 patients were included providing evidence that oral cryotherapy leads to large reductions in oral mucositis of all severities in adults receiving 5FU for solid cancers. However there was less confidence confident in the ability of oral cryotherapy to reduce oral mucositis in adults receiving high-dose melphalan before haematopoietic stem cell transplantation (HSCT).