Biobloc is a type of orthodontic appliance used to posture forward the lower jaw. There are many other types of appliances such as Twin blocs, Frankels, Bionators, Twin force bite correctors, class II elastics and others, which attempt to do the same thing, but these other appliances exert a backward force or headgear effect on the growing maxilla. The result is an increase in the overall length of the front teeth and restriction of maxillary forward growth.The main reason these other appliances do not achieve what the Biobloc therapy achieves is the fact that Biobloc therapy is based around the "fixing" of the environmental problems that have reduced or stalled or distorted the genetic potential of the patients growth, and such is termed "growth guidance" In particular the biobloc stage three is not a functional orthopeadic appliance like the other appliances mentioned in this descriptor; rather it is a therapeutic appliance specifically designed to get the tongue posture and function back into harmony with the other facial and masticatory muscles so that the result- a more attractive and correct face and dentition and posture- is going to remain after treatment has finished.

The Biobloc accomplishes forward positioning without adverse side effects by the use of flanges which do not touch the patient's tissue unless they posture their lower jaw open or back. The Biobloc is best used during the mixed dentition when growth is still available. For this reason, the Biobloc is primarily used on children between six and ten years of age. It can be used with any dental class and by combining it with a technique that includes extraction of the primary C, D and E teeth, and can close the bite in such a way that only surgery could accomplish for an adult.

Biobloc was first used by Dr. John Mew. His research into the subject revealed that the position of the jaw is influenced by tropic factors. Using proper posture of the mandible could guide the jaws to grow their proper form. Further, tropic factors are the cause of malocclusion.

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