“It seems that most orthodontic efforts merely trade off natural malocclusion for an artificial malocclusion. Often a nice healthy malocclusion is traded off for a compound compromise. A child is one-fourth edentulated by loss of four bicuspids and four molars; the jaws are not mated in length; the lower jaw has to reach forward to close; if the patient should try to bite rear-mostly, some high teeth would deflect the closure forward; and, the remnant dental arches have nearly approached the dimensions of the toothless. Such results are hardly worth retaining, yet if there were bunched lower incisors before and jungled upper incisors at the start, these compromised one-forth edentulated dentitions will have to be retained a long time to prevent rebunchings.”
Dr. Harvey Stallard, PH.B, PH.D, D.D.S. 1955 "Oral Rehablitation & Occlusion"

“It is easy to understand that our diagnosis and our plan of treatment will be no better than our concept of health, and our service to our patient will be no better than our ability to differentiate the smallest deviation from the normal”
Dr. B.B. McCullum, D.D.S. 1928 "A Research Report"

"Successful functional esthetic dentistry depends on mastering a thorough understanding of natural (genetic) unworn tooth forms, proper form of the occluded dentition and temporomandibular joints as well as the periodontium. With this knowledge, restorative dentists and orthodontists are able to treat dentognathic and esthetic problems with dental restorations and/or orthodontics that result in beautiful natural looking smiles, stable TMJ’s, comfortable muscles, efficient chewing, and dentitions that last a lifetime.”
Dr. Robert L. Lee, D.D.S., M.S. 1974 "Principles of Occlusion"