Dr. Dympna Kavanagh:

It is within the appropriate period of time. Generally it is within 24 hours, though it does not have to be. For example, if a patient rings in and the dental professional decides it is not necessary for them to be seen because they are not in pain, that is their decision. It is not a question of where it is best set or seated. It is part of one's dental professional ethics and emergency care must be provided.