Retention Protocol Calculator
Determine retainer type, wear schedule, and replacement interval based on relapse risk factors and time since treatment.
About this calculator
Orthodontic relapse -- teeth drifting back toward their pre-treatment position after braces or aligners come off -- is common enough that the American Association of Orthodontists recommends indefinite retainer wear rather than a fixed end date. This calculator builds a relapse-risk score from the case factors most consistently associated with a higher chance of relapse: the original crowding severity (more severe crowding means more periodontal and gingival fiber tension pulling teeth back), the patient's age (adolescents who are still growing carry more relapse potential than adults), whether tooth rotations were corrected (rotated teeth are notorious for relapsing because the circumferential gingival fibers around the tooth retain "memory" of the old position for months after the fibers around other tooth movements have reorganized), whether a midline or other diastema was closed (spaces have a well-documented tendency to reopen), and whether extractions were part of treatment (extraction sites need longer-term space maintenance).
That score then drives two things: which retainer type is recommended (higher-risk cases lean toward a bonded fixed retainer in addition to a removable one) and how the wear schedule steps down over time, starting at full-time wear in the first six months post-debond and tapering to nighttime-only wear, per commonly cited retention protocols. Treatment type (fixed braces vs. clear aligners) is captured for the case record but does not change the recommended retention protocol here, since post-debond relapse risk and retention principles are driven by the case factors above rather than by which appliance delivered the original tooth movement.
Medical Disclaimer
This calculator is for informational and educational purposes only. It is not a substitute for professional medical advice, diagnosis, or treatment. Always consult a qualified healthcare provider before making decisions about your health. Never disregard professional medical advice or delay seeking it because of results from this tool.
Inputs
Results
Relapse Risk Score
45
How to Use This Calculator
- Enter Months Since Debond, select the Original Crowding Severity, and enter the patient's current Age.
- Select the Treatment Type completed, and whether this was an Extraction Case.
- Select whether Rotations were Corrected and whether a Diastema was Closed during treatment.
- Review the recommended Upper and Lower Retainer types, the current Wear Phase, and Daily Wear Hours.
- Note the Relapse Risk score, Essix Replacement Interval, and estimated annual retainer costs to plan follow-up.
How the result changes with Patient Age
| Patient Age | Relapse Risk Score |
|---|---|
| 8 | 50 |
| 12 | 50 |
| 24 | 35 |
| 40 | 35 |
What each input means
- Months Since Debond
- Months since braces were removed or aligner treatment ended.
- Original Crowding Severity
- Original crowding severity before treatment.
- Patient Age
- Current patient age in years.
- Treatment Type
- Appliance type used for active treatment. Recorded for the case record; retention protocol below is driven by relapse risk factors, which are similar regardless of appliance.
- Extraction Case
- Whether teeth were extracted during treatment.
- Rotations Corrected
- Whether significant tooth rotations were corrected.
- Diastema Closed
- Whether a diastema was closed during treatment.
What each result means
- Relapse Risk Score
- Risk of orthodontic relapse (0-100). Higher = more risk.
- Daily Wear Hours
- Recommended hours per day to wear removable retainer.
- Essix Replacement Interval (months)
- How often to replace clear Essix retainers.
- Annual Essix Cost ($)
- Estimated annual cost for Essix retainer replacements.
- Annual Fixed Retainer Cost ($)
- Estimated annual maintenance cost for bonded retainer.
- Next Replacement (months)
- Months until next retainer replacement is due.
- Months Since Debond
- Current time since orthodontic appliances were removed.
How this is calculated
Worked example, using the default values
- Identify Input Parameters4 parametersMonths Since Debond = 0, Original Crowding Severity = 1, Patient Age = 16, Treatment Type = 0 = 7 input(s) provided
- Calculate Relapse Risk ScoreRelapse Risk Score45 = 45
- Calculate Daily Wear Hours22 = 22
- Calculate Essix Replacement IntervalEssix Replacement Interval6 = 6
Engine last updated . Checked against 4 independently-derived tests — how we verify calculators. Built by Paul Gunder, a software engineer, not a licensed financial, medical, or legal professional.
Frequently Asked Questions
Why do rotated teeth relapse more than teeth that were simply tipped into place?
The gingival and periodontal ligament fibers that wrap circumferentially around a tooth retain a kind of positional memory after a rotation is corrected, and they reorganize more slowly than the fibers involved in other types of tooth movement. That is why this calculator adds meaningfully to the relapse-risk score when rotations were corrected, and why some protocols include a fiberotomy for severely rotated teeth to help release that tension before retention begins.
Does a younger patient really need a different retention approach than an adult?
Yes -- a growing patient's jaws and dentition continue to change through adolescence, which adds an additional source of potential shift on top of the same fiber-tension and muscle-balance factors that affect adult relapse, so this calculator scores younger patients as higher relapse risk. Practically, that often means firmer retention (including consideration of a bonded retainer) is favored for patients still in active growth.
Why does a closed diastema (gap) tend to reopen more than a rotation-only case?
Spaces between teeth, especially at the midline, are influenced by factors beyond simple tooth position -- frenum attachment, tongue posture, and the balance of muscular forces from the lips and cheeks all continue to act on the space after treatment, which is why diastema closure is treated as its own relapse-risk factor in this calculator rather than folded into general crowding severity.
Why does the recommended wear schedule change over time instead of staying constant?
The periodontal and gingival fibers that were stretched or compressed during active tooth movement reorganize gradually after the appliance is removed, so the risk of relapse is highest in the first months post-debond and gradually declines. This calculator's wear schedule mirrors that biology: near-full-time wear immediately after debond, stepping down to nighttime-only wear as the months since debond accumulate, though higher relapse-risk cases keep the full-time phase longer.
Does the type of appliance used during treatment change the retention protocol?
In this calculator, no -- Treatment Type is recorded for the case file, but the retention recommendation is driven entirely by the relapse-risk factors above (severity, age, rotations, diastema, extractions), which apply similarly whether the case was treated with fixed braces or clear aligners. Retention needs are a function of how much the tissues and bone were remodeled, not which appliance did the remodeling.
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