Mesial drift can be defined as the tendency of teeth to move in a mesial direction within the arch with an aim to maintain interproximal contact between teeth.
Mesial drift can be because of physiological, pathological or induced reasons (for e.g.: in case of orthodontic tooth movement to obtained desired results during treatment).
You can observe this phenomenon when you loose a tooth. The tooth gap normaly close by itself after years, depending on the age of the patient.

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► TMJ Self-Adjustment Correction: Learn What No One Is Teaching You - Dr Mandell
► OCCLUSION: Condylar Axis Movement from Centric Relation to MIP
► WEBINAR: Occlusion - Part 1
► WEBINAR: Occlusion - Part 2
You can observe this phenomenon when you loose a tooth. The tooth gap normaly close by itself after years, depending on the age of the patient.
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► More videos of Occlusion and TMJ:
► TMJ Self-Adjustment Correction: Learn What No One Is Teaching You - Dr Mandell
► OCCLUSION: Condylar Axis Movement from Centric Relation to MIP
► WEBINAR: Occlusion - Part 1
► WEBINAR: Occlusion - Part 2