Recognising when to consult a root canal dentist involves being aware of certain symptoms that indicate underlying issues requiring professional attention. Common signs include severe toothache, prolonged sensitivity to hot or cold, discolouration of the tooth, swelling, and tenderness in the nearby gums. If you experience any of these symptoms, it's crucial to seek the expertise of a root canal dentist who can accurately diagnose and treat the problem, potentially saving the affected tooth and preventing further complications.