Mouth cancer can appear in different forms and can affect all parts of the mouth, tongue and lips. Mouth cancer can appear as a painless mouth ulcer that does not heal normally. A red or white patch in the mouth can also develop into cancer. Using this 8-step screen guide, look for any unusual lumps in your mouth and jaw area. If these areas do not heal within 3 weeks, visit your dentist or doctor, or if your unsure just book in for a check-up anyway!