The most logical explanation for causing swelling beneath the eye caused by an abscessed maxillary canine is that the ________.
1) lymphatics drain superiorly in this region.
2) bone is less porous superior to the root apex.
3) infection has passed into the angular vein which has no valves.
4) the root apex lies superior to the attachment of the caninus and levator labii superioris muscles.

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