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Your dental midline is the imaginary vertical line that should run between your two front teeth, ideally lining up with the centre of your face. When it doesn't, it's called a midline shift, and while it is often subtle enough that only the person looking in the mirror notices, some people find it bothers them enough to want it corrected.
What a Midline Shift Actually Is
A midline shift means the centre point between your upper front two teeth, or your lower front two teeth, does not align with the centre of your face, or the upper and lower midlines do not align with each other. It can be barely noticeable or, in more pronounced cases, visually asymmetric enough to be a genuine cosmetic concern.
What Causes It
Midline shifts can result from asymmetric tooth loss, where a tooth was lost or extracted on one side and neighbouring teeth drifted to fill the gap, uneven jaw growth, habits like chewing predominantly on one side over many years, or simply natural variation in how teeth erupted. In some cases it is linked to a broader bite issue like crossbite, rather than being an isolated problem.
Can Clear Aligners Correct It?
For mild to moderate midline shifts, particularly ones caused by dental factors like drifting or asymmetric spacing rather than significant skeletal asymmetry, clear aligners can be effective. Treatment works by carefully repositioning teeth on one or both arches to bring the midlines back into better alignment with each other and, where possible, with the centre of the face.
More significant asymmetry, particularly where the jaw bones themselves are asymmetric rather than just the teeth, is a more complex case that may need a different treatment approach or a combination of approaches.
What Treatment Involves
Correcting a midline shift often means moving teeth on one arch more than the other, or moving different amounts on the left and right sides of the same arch, which is part of why an accurate initial assessment and treatment plan matters. Results are checked throughout treatment to confirm the movement is tracking as planned.
Frequently Asked Questions
Is a midline shift a serious problem?
Not typically a functional problem for most people, though it can be a cosmetic concern. Whether it's worth correcting is a personal decision based on how much it bothers you.
Can a small midline shift be left untreated?
Yes, many people have a mild midline shift that is not clinically significant and does not require correction unless it is a cosmetic priority for the individual.
How long does it take to correct a midline shift?
This depends on the degree of shift and whether other alignment issues are being addressed at the same time, so timelines vary by case.
Will my midline ever be perfectly centred?
Treatment aims for meaningful improvement, but perfect symmetry isn't always achievable or even part of the treatment goal, since some natural asymmetry is completely normal.
Find Out If You're a Good Candidate
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