Markham Family Dentist Cosmetic Dentistry Invisalign Veneers Dental Implants Dental Root Canals Teeth Whitening Crowns and Dental Bridges Dentistry For Children Markham White Fillings Custom Mouthguards Oral Cancer Screening Oral Cancer Screening Oral cancer screening is an examination performed by a dentist or doctor to look for signs of cancer or precancerous conditions in your mouth.