Is it normal to get headaches when starting Invisalign?

Yes — mild headaches or head/temple/jaw muscle soreness soon after starting Invisalign or other clear aligners are reported in the clinical literature and are generally recognized as an early, usually transient, treatment symptom. [2, 3]

Quick takeaways

• Mild headaches or jaw/muscle soreness are reported soon after starting clear aligners and often peak in the first 24–48 hours.
• Most early pain and soreness is described as mild and transient; persistent, worsening, or severe headaches should prompt clinician contact.
• Evidence links short-term muscular/jaw discomfort to early aligner wear but does not establish that aligners cause chronic TMJ disorder or long-term headaches. [2, 3]

What the research says

Systematic reviews and clinical studies of removable clear-aligner therapy report that pain and discomfort are common early after a new tray is placed, with the worst symptoms typically in the first 24–48 hours. Some included reports list TMJ pain and headache among the adverse effects described by patients. [2]

A multi-site prospective study measuring tooth pain and masticatory muscle soreness in patients beginning clear-aligner therapy found measurable early muscle/tenderness changes, which can be associated with head or temple discomfort. [3]

A systematic review focused on TMJ outcomes noted the evidence is limited and heterogeneous: while some studies report facial pain, muscle soreness or headache-like symptoms with aligner therapy, the data do not establish a causal link to chronic TMJ disorders or persistent headaches. [1]

Typical pattern and when to worry

Most reported pain and muscle-soreness effects are mild and transient, often worst in the first 1–3 days after a new tray; they tend to subside as you adapt to the aligners. [2, 3]

However, studies and manufacturer/regulator guidance agree that persistent, severe, worsening, unilateral, or neurologic symptoms are not the usual pattern and should prompt contacting your treating dentist or orthodontist. [4, 5]

Practical steps you can take

Expect some mild soreness or headache-like discomfort after inserting a new tray; over-the-counter pain relief and short rest often help, but follow any instructions your clinician gave you. [2, 3]

If headaches are severe, get steadily worse, or come with other worrying signs (facial numbness, vision changes, or persistent jaw locking), stop using the device if your clinician advised doing so and contact your provider promptly—regulatory and manufacturer materials recommend supervised use and professional follow-up for adverse symptoms. [4, 5]

How Smilo can help you track symptoms and routines

Use Smilo’s wear-time timer and tray-change tracking to log when you insert or switch trays and to see your daily out-of-mouth time; having a clear record of tray changes and wear duration can help you and your clinician link the timing of headaches or soreness to specific tray starts and decide if a follow-up is needed.