Sucking ice cube during IV chemo to stop sore mouth

A very good friend of mine who had done chemo before me advised me to take two bottles of ice cold water and sip on them comtinually during my chemo. I used to half fill them with water and freeze it overnight and then top them up with water the morning of chemo. I did this and never got mouth ulcers. Not sure if that was the reason, but I felt it helped. 
Good luck. 
Paula xx