Functional Appliances & Myofunctional Therapy in Jacksonville, FL

Orthopedic Appliances vs. Behavioral (Myofunctional) Therapy

The word functional covers two related but distinct approaches. Orthopedic appliances apply measurable force to the growing jaw bones to change their position. Myofunctional therapy retrains the tongue, lips, and swallowing muscles through daily exercises so the patient’s own muscle patterns stop working against the bite.

Most comprehensive treatment plans at Bold Bite Orthodontics use both, appliance force to move the skeleton, exercise protocols to hold the result.

Data table
Appliance or Therapy	What It Treats	How It Works	Typical Age	Wear or Cadence	Where It Fits
Herbst	Class II overbite driven by a recessed lower jaw	Fixed telescoping rod-and-tube appliance cemented to the back teeth; holds the lower jaw forward 24 hours a day	10–14 (peak growth)	Fixed — not removable	Typically paired with braces; preferred when compliance with a removable appliance is a concern
MARA	Class II overbite driven by a recessed lower jaw	Fixed crown-and-arm appliance that postures the lower jaw forward when the teeth close together	10–14 (peak growth)	Fixed — not removable	Alternative to Herbst; lower profile, easier to clean around, fewer emergencies
Twin Block	Class II overbite in younger or pre-peak growth patients	Two removable acrylic blocks (upper and lower) that interlock to posture the jaw forward when biting or chewing	9–12	20–24 hours per day	Occasional alternative when compliance is strong and the patient is younger than the Herbst/MARA window
Tongue Crib	Tongue thrust, anterior open bite, thumb habit	Fixed wire cage behind the upper incisors that physically blocks the tongue tip or thumb from pressing forward against the teeth	6–12	Fixed until habit extinguishes	Last-resort tool after the myofunctional exercise protocol has been tried
Bluegrass Appliance	Thumb sucking, tongue thrust	Fixed palatal roller the tongue turns against instead of pressing forward; converts the habit into a neutral motion	6–12	Fixed for roughly 6 to 9 months	Less invasive than a tongue crib; preferred when the patient cooperates with exercises but cannot break the physical habit
Myofunctional Exercise Protocol	Tongue posture, lip seal, nasal breathing, swallow pattern	Structured daily exercises (5–10 minutes) coached in-office, practiced at home, reviewed at each visit	Any age — most effective 6 and older	Daily for 4 to 12 weeks of active coaching	First-line therapy at Bold Bite before any habit breaker is prescribed
Myofunctional Therapy Referral	Complex swallowing pattern issues, severe tongue posture dysfunction, tongue-tie complications	Partner therapist handles intensive weekly sessions; Bold Bite runs the orthodontic phase concurrently	Any age	3 to 12 months depending on complexity	Referred to Southern Speech and Myo when in-office coaching is not sufficient

Bold Bite does not offer Myobrace, Angel A6, Bionator, Activator, or Frankel appliances. The two-doctor team selects from the tools listed above because each has a defined evidence base in the literature and fits the growth-modification decisions Dr. Greenberg and Dr. Cao make every week. Patients seeking one of the appliances the practice does not stock are welcome to consult with Bold Bite for a second opinion before committing to a treatment plan elsewhere.

Class II Correctors for Growing Patients

The most common functional-appliance case at Bold Bite is the growing teenager with a Class II overbite driven by a lower jaw that sits too far back. Upper front teeth protrude, the chin looks recessed in profile, and the lip cannot close comfortably over the incisors. When the patient still has meaningful mandibular growth remaining, a Class II corrector advances the lower jaw forward during the growth window — a biological window that closes in most patients by 14 to 16 in boys and 12 to 14 in girls.

How Bold Bite Decides Between Herbst, MARA, and Twin Block

Dr. Greenberg and Dr. Cao co-plan every growth-modification case from the Vatech Green 3D CT scan and the iTero occlusal map taken at the consultation. The decision between appliances depends on four measured factors: the patient’s skeletal age (hand-wrist film or cervical vertebrae on the CBCT), the severity of the ANB angle, the compliance profile for removable versus fixed wear, and the arch length available for bracket clearance. Herbst and MARA are the default choices because they are fixed — compliance is guaranteed — and because both integrate cleanly with a braces phase running in parallel. Twin Block is reserved for pre-peak growth patients under 12 with strong parent-supported compliance and a preference for a removable approach.

Herbst Appliance

The Herbst is a fixed telescoping appliance: a rod-and-tube assembly connects the upper molar to the lower premolar on each side, holding the lower jaw forward 24 hours a day. It is the most-studied Class II corrector in the literature, with strong evidence for mandibular advancement during active growth. The standard Bold Bite protocol runs the Herbst for 9 to 12 months, removes it once the overbite is overcorrected slightly (to anticipate settling), and transitions directly to braces for final tooth alignment. Because it is fixed, there is no compliance variable — the appliance either stays in or it breaks, and broken Herbst rods are repaired same-day in-office on the Vatech scan already on file.

MARA (Mandibular Anterior Repositioning Appliance)

The MARA is a lower-profile fixed corrector. Crowns cemented to the upper first molars carry small rectangular arms; when the patient closes, the lower teeth slide against those arms and the jaw postures forward. The MARA is easier to clean around than the Herbst, produces fewer emergency visits for broken hardware, and tends to feel less bulky for teen patients who are self-conscious about the mechanism showing when they speak. Treatment duration is similar to the Herbst at 9 to 12 months. Cases with severe Class II (greater than 7 mm of overjet) sometimes respond better to the Herbst’s continuous posturing; the treatment plan documents which design was chosen and why.

Twin Block

The Twin Block is a removable appliance in two pieces — an upper plate and a lower plate — with angled acrylic blocks that interlock when the patient bites down, posturing the jaw forward. It is used occasionally at Bold Bite for younger pre-pubertal patients (typically 9 to 11) whose growth spurt has not yet arrived and who respond well to removable wear. Compliance is the critical variable: the appliance must be worn 20 to 24 hours per day including during meals to produce the intended skeletal change. Parents are the compliance enforcers, and the practice weighs that realistically at the consultation.

Each of these appliances is included in the comprehensive braces fee when prescribed as part of a full treatment plan. Standalone growth modification (functional appliance only, no subsequent braces) is an uncommon request but is quoted separately when the clinical picture truly does not require post-functional alignment.

Habit Breakers: Tongue Crib, Bluegrass, Thumb-Sucking Appliances

Before a habit breaker is prescribed at Bold Bite, the patient runs the myofunctional exercise protocol for 4 to 12 weeks. Most tongue-thrust and thumb-sucking habits resolve with coached exercises alone, particularly in patients who are old enough to practice independently (roughly 7 and up). The appliances below are reserved for cases where exercises did not extinguish the habit — most commonly very young children who cannot practice reliably, patients with tongue-tie complications that mechanically prevent correct posture, or adults with deeply ingrained patterns resistant to coaching alone.

Bold Bite’s Order of Operations

Dr. Greenberg and Dr. Cao treat habit breakers as a last-resort layer rather than a first move. The logic: a fixed appliance that blocks the tongue or thumb suppresses the behavior but does not teach the correct posture. When the appliance comes out, the underlying muscle pattern often returns. Exercises teach the pattern first; the appliance is added only if the pattern will not stick.

Tongue Crib

A tongue crib is a fixed wire cage cemented to the upper molars and extending behind the front teeth. The wires physically block the tongue tip (or the thumb) from pressing forward against the incisors during swallowing or at rest. Bold Bite fabricates the tongue crib on the iTero digital scan and cements it at a single visit. It typically stays in for 6 to 12 months while the anterior open bite closes under the restored vertical growth, then is removed once the tongue has relearned the correct resting position against the palate. Speech is initially altered for 2 to 4 weeks while the tongue adapts around the wires; patients and parents are warned about this at the delivery visit.

Bluegrass-Style Roller

The Bluegrass appliance is a fixed palatal device with a small roller bead the patient spins with the tongue. It redirects the tongue-forward reflex into a neutral motion on the palatal bead rather than pressing between the incisors. It is particularly useful for patients who cooperate with the instructions but cannot break the physical thrust habit. Typical wear is 6 to 9 months, and many patients find it less intrusive than a tongue crib because the roller gives the tongue something to do rather than simply blocking movement.

When an Appliance Is Not the Right Answer

For tongue-tie-driven cases, a habit breaker compounds the problem — the restrictive frenum is already preventing correct tongue posture, and adding a fixed barrier on top traps the tongue in a worse position. Bold Bite coordinates frenectomy referral in those cases and runs myofunctional therapy after the release rather than using a habit appliance. For airway-driven mouth breathing, the underlying ENT finding (enlarged adenoids, narrow nasal airway, deviated septum) is addressed by an ENT before any oral appliance is considered. Bold Bite’s airway screening on the Vatech Green 3D CT scan flags these cases at the first consultation.

Myofunctional Therapy: Retraining Tongue, Lips, and Swallow

Myofunctional therapy teaches the tongue to rest against the palate, the lips to seal comfortably without effort, the breath to flow through the nose, and the swallow to travel with the tongue tip on the palatal rugae rather than between the teeth. These four targets matter because the tongue and lip muscles press on the teeth and jaws roughly 2,000 times a day through swallows, rest posture, and breathing patterns. That continuous low-grade force shapes where the teeth erupt and where the upper arch finishes growing. Orthodontic mechanics can move teeth; they cannot permanently override a tongue pattern working against them for the rest of the patient’s life.

In-Office Exercise Protocol

Bold Bite provides the core myofunctional exercise protocol in-house as a standard part of comprehensive treatment for open-bite, mouth-breathing, and tongue-thrust cases. The coached visit runs roughly 30 minutes, with a daily home-practice routine of 5 to 10 minutes. Parents of young patients are coached on how to reinforce the exercises between visits so the child hears the same cues at home that the team gave in-office. Progress is checked at each regular orthodontic visit so exercise compliance does not slip mid-treatment.

Specialty Referral to Southern Speech and Myo

For cases that need a dedicated orofacial myofunctional therapist — complex swallowing pattern issues, severe tongue posture dysfunction, or tongue-tie complications — Bold Bite coordinates referral to Southern Speech and Myo, the practice’s primary myofunctional therapy partner in the Jacksonville area. The therapist handles intensive weekly coaching, home-exercise tracking, and speech-pattern retraining; the orthodontic phase at Bold Bite runs concurrently so timing is coordinated. The practice reviews the estimated cost and insurance coverage at the consultation so families are not surprised mid-treatment — myofunctional therapy coverage varies across Florida PPO plans.

Why Exercises Precede Appliances

At Bold Bite, the default sequence for any habit-driven malocclusion is exercises first, appliances second. A tongue-thrust patient who learns the correct swallow pattern through coaching rarely needs a tongue crib afterward. A mouth-breathing patient who clears the airway and rebuilds nasal breathing through exercises usually stops flaring the incisors. Mechanical blockers are added only when the pattern persists despite coaching — a roughly 1-in-5 outcome for patients who engage seriously with the protocol. This ordering reflects Dr. Cao’s CAGS training at Jacksonville University, which emphasizes neuromuscular and airway integration in growth-modification planning, and Dr. Greenberg’s airway-aware approach to every Class II and open-bite consultation.

When Functional Appliances Work Best

Functional appliances depend on growth. The biology that makes them work — bone remodeling, muscle adaptation, condylar response to forward posturing — only happens meaningfully in patients who have active mandibular growth remaining. That window closes in most patients by 14 to 16 in boys and 12 to 14 in girls, though Bold Bite confirms growth status individually using the cervical vertebrae maturation index on the Vatech Green 3D CT scan rather than trusting chronological age alone.

First Orthodontic Evaluation by Age 7

The American Association of Orthodontists recommends a first orthodontic evaluation by age 7. That timing is not about starting treatment early — it is about identifying the small subset of children who will benefit from a Phase 1 functional intervention before the growth window closes. Most 7-year-olds who come to Bold Bite for a screening do not need any appliance. A small percentage — typically those with severe crossbites, impinging deep bites, developing habits, or airway findings on the CBCT — are scheduled for a return visit or a Phase 1 plan.

Class II Correction in the Peak Growth Window

Herbst and MARA appliances produce the most skeletal change when fitted during the peak of mandibular growth, typically ages 10 to 14. Fitting them too early wastes the growth spurt on incomplete correction; fitting them too late produces primarily dental tipping with limited skeletal effect. Bold Bite uses the cervical vertebrae maturation (CVM) stage on the CBCT lateral cephalometric view to time the decision individually. CVM stages 3 and 4 are the optimal window; CVM 5 and 6 patients get the appliance but are counseled that the response will be smaller.

Habit Correction Before Permanent Incisor Eruption

Tongue thrust, thumb sucking, and pacifier habits are best addressed before the permanent incisors erupt — roughly age 6 to 7. If the habit extinguishes before eruption, the teeth often erupt into a normal bite without any mechanical intervention. After age 7 to 8, incisor position is already partly determined by the habit, and habit correction is paired with mechanical closure. Bold Bite screens every 6- and 7-year-old consultation for active habits specifically for this reason.

Adult Cases: Myofunctional Therapy Still Applies

Adults past the growth window cannot benefit from skeletal functional appliances, but myofunctional therapy is fully appropriate at any age and is often the missing layer in adult retreatment cases. An adult with recurring anterior open bite after a prior orthodontic treatment almost always has an uncorrected tongue-thrust pattern sustaining the relapse. Bold Bite evaluates and treats adult myofunctional cases alongside Invisalign, Angel Aligners, or braces — and coordinates orthognathic surgery for the severe skeletal component cases where tooth movement alone cannot produce a stable result.

What Functional Appliances and Myofunctional Care Cost

Functional appliances at Bold Bite are typically included in the comprehensive braces fee when they are part of a multi-phase treatment plan, so families see one fee rather than a stack of add-ons. Standalone pricing below applies when an appliance is prescribed on its own — most often Phase 1 growth-modification cases that do not progress directly to a full Phase 2 braces phase.

Functional Appliance Pricing — Standalone

Herbst or MARA (Class II corrector): included with comprehensive braces fee; standalone pricing reviewed at the consultation
Twin Block (removable Class II): included with comprehensive treatment plan when prescribed
Tongue crib or Bluegrass habit breaker: typically $600 to $900 depending on design complexity
In-house myofunctional exercise protocol: included as part of open-bite, mouth-breathing, or tongue-thrust care — no separate fee
Specialty myofunctional therapy referral: billed directly by Southern Speech and Myo; coverage varies by insurance plan and is reviewed at consultation

Phase 1 expanders, when prescribed alongside a functional appliance, are quoted separately at $2,500 to $3,000. Every fee is written into the financial agreement before treatment begins — no surprise front-desk add-ons.

Bold Bite Orthodontics accepts most Florida PPO dental insurance plans and files claims as a courtesy so families only pay their estimated out-of-pocket portion at each visit. Financing options for any appliance fee that lands on the family directly:

In-House 0% APR: 0% interest, no credit check, custom down-payment and term
CareCredit: $0 down with approved credit, promotional zero-interest plans available
Cherry: $189 down, soft credit check, flexible terms
Pay in Full: 5% discount for families paying the full fee at the start of treatment

Community discounts — military, teacher, first responder, and family discounts — stack where eligible when the functional appliance is part of a comprehensive plan. See the insurance guide and the discounts page for specifics. Book a free consultation for a personalized quote that includes the Vatech Green 3D CT scan, iTero digital records, growth-status assessment, and a written treatment plan with all fees itemized.

Frequently Asked Questions

What exactly is a functional appliance?

A device that applies measurable force to the growing jaw bones to change their position relative to each other. It works on the skeleton and muscles rather than on individual teeth. The three functional appliances Bold Bite uses are Herbst, MARA, and Twin Block — all Class II correctors that advance a recessed lower jaw in a growing patient.

Does Bold Bite offer myofunctional therapy, or is it only a referral?

Both. The core myofunctional exercise protocol is provided in-house as part of comprehensive care for open-bite, mouth-breathing, and tongue-thrust cases. For patients who need a dedicated orofacial myofunctional therapist — complex swallowing pattern issues, severe tongue posture dysfunction, or tongue-tie complications — Bold Bite coordinates referral to Southern Speech and Myo in Jacksonville and runs the orthodontic phase concurrently.

Why doesn’t Bold Bite offer Bionator, Activator, or Frankel appliances?

The practice chose Herbst, MARA, and Twin Block as its Class II correctors because all three have strong published evidence, integrate cleanly with a subsequent braces phase, and fit the compliance profile of the typical teen patient. Bionator, Activator, and Frankel are clinically valid alternatives that other orthodontists prefer; Bold Bite does not stock them. Patients who specifically want one of those designs are welcome to consult with the practice for a second opinion and a recommendation on where to receive it.

How long does a Herbst or MARA appliance stay in?

Typically 9 to 12 months, followed by a braces phase for final tooth alignment. The appliance is removed once the overbite is slightly overcorrected — the bite settles back toward ideal during the post-functional braces phase, and a small overcorrection is expected to end in a stable final relationship.

What is a habit breaker appliance, and when is it used?

A habit breaker is a small fixed appliance — usually a tongue crib or a Bluegrass-style roller — that sits behind the upper incisors and blocks the tongue or thumb from pressing forward against the teeth. Bold Bite uses habit breakers as a last-resort tool after the myofunctional exercise protocol has been tried, typically for young children who cannot reliably practice exercises or for patients whose tongue pattern has not responded to coaching alone.

Can adults use functional appliances?

Adults past the growth window cannot produce the skeletal change that Herbst, MARA, or Twin Block require, so those appliances are not prescribed for adult patients. Myofunctional therapy, in contrast, is fully appropriate at any age and is often the missing layer in adult retreatment cases — particularly recurring anterior open bite. Bold Bite pairs myofunctional therapy with Invisalign, Angel Aligners, or braces for adult cases, and coordinates orthognathic surgery for the severe skeletal component cases that tooth movement alone cannot resolve.

How much does a functional appliance cost at Bold Bite?

Herbst, MARA, and Twin Block are typically included in the comprehensive braces fee when prescribed as part of a full treatment plan. Tongue crib and Bluegrass habit breakers are usually $600 to $900 standalone. The in-house myofunctional exercise protocol has no separate fee when it is part of open-bite, mouth-breathing, or tongue-thrust care. Specialty myofunctional therapy referral is billed directly by Southern Speech and Myo and reviewed for coverage at the consultation.

Conditions Functional Appliances Address

Mouth breathing. Functional appliances guide jaw posture and tongue position, reducing the upper-airway pattern that drives habitual mouth breathing.
Tongue thrust. Fixed and removable habit cribs interrupt the forward tongue posture so the bite has space to correct.

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