Finishing the last active tray is the start of retention, not the end of orthodontic maintenance.
Why retention matters
Teeth can shift after orthodontic treatment. The AAO describes retainers as a way to maintain the new position while surrounding tissues adapt and over the longer term. Ask the treating clinician which retainer is planned for your case and when it will be fitted. Do not assume the last Invisalign tray substitutes for a retainer.
Compare retainer forms
A retainer may be removable or fixed behind teeth. Each has different cleaning and repair needs. Ask how the proposed device works with your bite and any planned veneers, bonding, or crowns. If other cosmetic work is scheduled after aligners, ask whether it changes the timing of the retainer impression or scan.
Get a written wear plan
Ask exactly how often to wear the retainer, when the schedule might change, and when the office will check it. There is no universal end date to infer from a website. The AAO advises continued retention because teeth can shift over time. Include replacement costs and the process for obtaining another retainer in the treatment estimate.
Respond to fit problems
A retainer that no longer seats or causes pain should be assessed; forcing it can be a poor substitute for an examination. Contact the treating office promptly if it breaks or goes missing. Continue usual brushing, interdental cleaning, and dental checkups, particularly around a bonded fixed retainer where plaque can accumulate.
Questions to ask
Do teeth stay in place after aligners?
They can move again; follow the individual retainer plan and keep scheduled checks.
Is a replacement included?
Ask the practice to identify replacement terms in the written quote.
What if the retainer feels tight?
Ask the treating clinician; do not force a painful or non-seating appliance.