Does Acromegaly Cause Jaw Changes and Malocclusion?

Yes, acromegaly can significantly change the shape of your jaw and the way your teeth fit together. Because the disease involves an excess of growth hormone over a long period, it often causes the bones in your face and jaw to continue growing. This can lead to a widening of the jaw, the development of an underbite, and new gaps forming between your teeth ^[1][2]. For many people, these visible changes to their smile and bite are among the first signs that prompt them to seek medical or dental help.

How Acromegaly Affects Your Jaw and Teeth

Excess growth hormone doesn’t just affect soft tissues; it alters the bone structure of your face. You may experience several specific changes:

• Mandibular prognathism: This is the medical term for when your lower jaw bone (mandible) grows longer and protrudes outward beyond your upper jaw ^[1][2].
• Dental malocclusion (underbite): Because the lower jaw grows more than the upper jaw, your upper and lower teeth no longer align properly. This creates what dentists call a Class III malocclusion, or a severe underbite ^[3][1].
• Diastema and Macroglossia: As your jawbone expands and widens, your teeth do not grow to fill the extra space, creating gaps (diastemas) ^[1][3]. This is often made worse by macroglossia (an enlarged tongue), which can physically push against the teeth and force them further apart.
• Periodontal inflammation: Acromegaly can increase inflammation in your gums, making periodontal (gum) disease more common. This can further affect the stability of your teeth ^[4].

These structural changes can also cause significant physical discomfort. A misaligned jaw often leads to temporomandibular joint (TMJ) pain, headaches, or difficulty chewing. Additionally, because the jaw and airway are closely linked, these changes can increase your risk for obstructive sleep apnea (OSA), a condition where breathing repeatedly stops and starts during sleep ^[5].

Do Jaw Changes Reverse After Acromegaly Treatment?

When you receive treatment for acromegaly—such as pituitary surgery or medication—the goal is to lower your growth hormone and IGF-1 levels to a normal range. Controlling these hormones will successfully stop the jaw from growing any further ^[6]. Treatment can also reduce soft tissue swelling in your face and tongue.

However, the structural bone changes to your jaw will not shrink or reverse on their own once the bone has grown ^[7][6]. To restore a normal bite, ease TMJ pain, and close the gaps in your teeth, you will likely need specialized dental and surgical care.

Fixing Your Bite: Orthodontics and Jaw Surgery

Fixing the structural changes caused by acromegaly requires a coordinated team effort, usually involving your endocrinologist, an orthodontist, and an oral and maxillofacial surgeon ^[8].

Timing is critical: Experts emphasize that you must achieve stable biochemical control (normal and stable hormone levels) before pursuing major surgical or orthodontic corrections. If your growth hormone levels are still high, your jaw could continue to grow, potentially ruining or reversing the results of any dental work ^[9][6]. Achieving this stability can take several months to over a year after starting your acromegaly treatment.

Once your hormone levels are controlled, your care team may recommend:

• Orthodontic treatment: Braces or clear aligners are used to close the gaps between your teeth and move them into better alignment ^[10].
• Maxillofacial (orthognathic) surgery: Many patients require surgery to physically reposition the jawbones ^[8]. Surgeons can perform procedures to set the lower jaw back, advance the upper jaw, or both, ensuring your teeth fit together correctly ^[11][12]. Correcting the jaw structure can vastly improve your ability to chew, reduce TMJ pain, and restore your facial proportions ^[11].

Managing Daily Life and Insurance

While waiting for your hormones to stabilize, establishing a relationship with a dentist who understands acromegaly is essential for routine monitoring. To manage chewing difficulties or TMJ pain in the meantime, you may need to rely on softer foods, cut food into smaller pieces, or use warm compresses on your jaw.

Finally, because jaw surgery and specialized orthodontics are expensive, navigating insurance can be stressful. Since these changes are caused by a medical condition (a pituitary tumor), ask your endocrinologist for a letter of medical necessity. This documentation helps ensure that these procedures are billed and covered as medical reconstruction rather than cosmetic dentistry.