These are metal braces which are placed on the inside surfaces of the teeth and therefore cannot be seen when smiling or opening the mouth. Treatment time using Lingual Braces is approximately the same as when using Damon Braces or Delta Force braces. Here again treatment is accomplished without extraction of teeth except in some very rare clinical situations. There are certain cases where wisdom teeth have not erupted and inhibit the orthodontic development of teeth and jaws to proper shape and form. In these cases it is sometimes expedient to have the offending wisdom teeth removed.