What This Guide Covers
This guide explains the four stages of gum recession and what each one means for your teeth and treatment options. Gum recession happens when the gum tissue around a tooth pulls back, exposing more of the tooth or its root. [1]
Dentists and periodontists use classification systems to describe how severe the recession is. The two most common are the Miller classification and the Cairo classification. Both systems look at how far the gum has pulled away from the tooth and whether the bone between your teeth has been lost. Each class describes a different level of damage and helps predict treatment outcomes.
This guide is for anyone who has been told they have gum recession, or who has noticed their teeth looking longer than before. It is also helpful if you want to understand the difference between early and advanced recession before speaking with a specialist.
The Miller Classification System Explained
Periodontists use classification systems to grade gum recession. The best-known is the Miller classification, developed in 1985. It has been widely taught and used for decades to help predict how much root coverage a gum graft or other procedure can achieve. A more recent system, the Cairo classification (2011), is also widely used today because it provides strong predictions for treatment success based on the interdental clinical attachment level, a factor the Miller system does not directly address. [3]
The Miller system groups recession into four classes based on how far the gum margin has receded compared to two landmarks: the mucogingival junction (the line where firm, pink gum tissue meets the softer, darker tissue below it) and the interdental bone (the bone between neighboring teeth). The condition of the interdental bone is critical because it acts as the scaffold that supports the gum tissue between teeth.
Class I: Recession That Has Not Reached the Mucogingival Junction
Class I recession is the mildest form. The gum has pulled back, but the recession does not extend past the mucogingival junction. The bone and soft tissue between the teeth remain intact.
Because the supporting structures between teeth are still healthy, root coverage procedures have a high success rate at this stage. A connective tissue graft, where a small piece of tissue is taken from the roof of the mouth and placed over the exposed root, is a common approach. In many cases, full root coverage is achievable with Class I recession. [4]
Patients with Class I recession may notice mild tooth sensitivity to cold foods or drinks. The exposed root surface may also appear slightly yellow compared to the tooth crown above it.
Class II: Recession That Extends Past the Mucogingival Junction
Class II recession is more advanced. The gum has receded past the mucogingival junction into the looser, more flexible tissue below. However, the bone and tissue between the teeth are still intact.
The key difference between Class I and Class II is how far the recession extends. In Class II, more root surface is exposed, and the area of attached gingiva (the firm gum tissue that tightly grips the tooth) may be very thin or absent. Despite this, the prognosis for root coverage remains favorable because the interdental bone has not been lost.
Treatment at this stage typically involves the same grafting techniques used for Class I recession. Full root coverage is still predictable in many cases, though the larger area of recession may require a slightly larger graft.
Class III: Recession with Partial Interdental Bone Loss
Class III recession marks a turning point. The gum has receded past the mucogingival junction, and some of the bone between the teeth has been lost. The tooth may also be slightly rotated or malpositioned.
Because the bone scaffold between teeth is partially damaged, the gum tissue cannot be rebuilt to its original height. A periodontist can typically achieve partial root coverage with a graft, but full coverage is difficult. The amount of coverage depends on how much bone remains and the position of the neighboring teeth. [4]
Patients with Class III recession often notice increased sensitivity and may see visible notches or grooves on the exposed root. The root surface may also be more prone to decay because root surfaces are softer than enamel.
Class IV: Severe Recession with Significant Bone Loss
Class IV recession is the most severe. The gum has receded significantly, and the bone between the teeth has been severely damaged or completely lost. The tooth may be drifted, rotated, or overerupted (pushed further out of the jaw than normal).
Full root coverage is generally not possible at this stage. Treatment goals shift from restoring the original gum line to protecting the remaining tooth structure, reducing sensitivity, and preventing further damage. Options may include grafting to stabilize the area, restorative dentistry such as tooth-colored fillings to cover exposed roots, or in some cases, extraction and replacement.
Class IV recession is often associated with advanced periodontal disease (gum disease that has progressed to affect the bone supporting the teeth). [1] Managing the underlying disease is essential before any surgical procedure.
The Cairo Classification: A More Recent System
In 2011, researchers introduced the Cairo classification as an update to the Miller system. Rather than four classes, it uses three recession types (RT1, RT2, and RT3) based on the interdental clinical attachment level, which is the measurable loss of the tissue that connects the gum to the tooth between neighboring teeth. [3]
RT1 (Recession Type 1) means there is no loss of interdental attachment. This corresponds roughly to Miller Class I and Class II, and full root coverage is a realistic goal. RT2 (Recession Type 2) means the interdental attachment loss is less than or equal to the buccal (cheek-side) attachment loss. Partial root coverage may be possible. RT3 (Recession Type 3) means the interdental attachment loss is greater than the buccal attachment loss. Root coverage is generally not predictable at this stage.
Your periodontist may use the Miller system, the Cairo system, or both when evaluating your recession. The important thing is that both systems help predict what treatment can realistically achieve for your specific situation.
What Patients Should Know About Recession Stages
Knowing your recession class helps you understand what treatment can realistically achieve. Not every case of gum recession requires surgery, and not every surgery can fully restore what was lost.
How a Periodontist Measures Recession
A periodontist measures recession using a small, thin instrument called a periodontal probe. The probe is gently placed between the gum and the tooth. The periodontist reads the markings on the probe in millimeters to determine how far the gum margin has moved from its normal position, which is typically at or near the cementoenamel junction (the line where the enamel of the tooth crown meets the softer root surface). [1]
The periodontist also checks the depth of the gum pocket around each tooth, the width of attached gingiva remaining, and whether the bone between the teeth is intact. These measurements together determine the Miller class and the Cairo recession type. Dental X-rays are often taken to confirm the level of bone between and around the teeth.
What Causes Gum Recession
Several factors can cause gums to recede. Aggressive tooth brushing with a hard-bristled brush is one of the most common causes, particularly for Class I and Class II recession on the outer surfaces of teeth. Periodontal disease is another major cause and is more commonly associated with Class III and Class IV recession because the infection destroys supporting bone. [1]
Other contributing factors include teeth grinding or clenching (bruxism), misaligned teeth that place uneven force on the gum tissue, tobacco use, thin gum tissue due to genetics, and hormonal changes. In some cases, orthodontic treatment can contribute to recession if a tooth is moved outside the bony housing of the jaw. [2]
When Recession Typically Appears
Gum recession can occur at any age, but it becomes more common after age 40. Mild recession in younger patients is often related to brushing habits or orthodontic movement. In older patients, a combination of years of mechanical wear, possible periodontal disease, and natural age-related changes in gum tissue thickness can all play a role.
Recession can be slow and painless, which is why many patients do not notice it until it has progressed. Regular dental check-ups that include periodontal measurements help catch recession early, when treatment is most predictable.
What to Expect During Evaluation and Treatment
A periodontal evaluation for gum recession typically takes 30 to 60 minutes and includes a thorough examination of your gums, teeth, and supporting bone.
The Evaluation Visit
During your first visit, the periodontist will review your medical and dental history. They will examine your gums visually and with a periodontal probe. They will measure the recession in millimeters at each affected tooth and note the width of attached gingiva.
X-rays will be taken to evaluate the bone levels between and around the teeth. The periodontist will classify the recession using the Miller system, the Cairo system, or both, and explain which class or type each site falls into. They will then discuss treatment options, expected outcomes, and any factors that could affect healing, such as smoking or uncontrolled diabetes.
Treatment Options by Stage
For Class I and Class II recession (or Cairo RT1), the most common surgical treatment is a connective tissue graft. The periodontist removes a small piece of tissue from beneath the surface of the palate (roof of the mouth) and places it over the exposed root. The gum tissue is then repositioned to cover the graft. Healing typically takes two to four weeks, with full maturation of the tissue occurring over several months. [4]
Alternative grafting materials include acellular dermal matrix (processed donor tissue) and collagen membranes. These options avoid the need for a second surgical site on the palate. Results vary depending on the material used and the individual case.
For Class III recession (or Cairo RT2), a periodontist may use the same grafting techniques but will set realistic expectations for partial root coverage. The treatment may also involve addressing underlying periodontal disease before the graft procedure.
For Class IV recession (or Cairo RT3), treatment focuses on stabilization rather than full coverage. Options include soft tissue grafting to thicken the remaining gum, tooth-colored composite bonding to protect exposed roots, or prosthetic options if the tooth is no longer salvageable. Managing the underlying periodontal condition is a critical first step. [1]
Recovery After Gum Grafting
Most patients experience mild to moderate discomfort for the first few days after a gum graft. Over-the-counter pain relievers or a prescribed medication typically manage the discomfort. Swelling and bruising are normal and usually resolve within a week.
Patients are generally advised to eat soft foods for one to two weeks and to avoid brushing or flossing the surgical site until the periodontist gives clearance, usually at a follow-up visit about seven to ten days after surgery. Strenuous physical activity should be avoided for several days to reduce the risk of bleeding.
Full healing of the graft site takes several weeks, and the final appearance of the gum tissue may not be visible for three to six months as the tissue matures and settles into its new position.
Cost Factors for Recession Treatment
The cost of gum recession treatment depends on the type of procedure, the number of teeth involved, and the severity of the recession. Costs vary by location, provider, and case complexity.
A connective tissue graft for a single tooth typically ranges from $700 to $1,500, though costs can reach $3,000 or more for complex cases. [6] Factors that affect cost include the geographic location of the practice, the experience of the provider, the extent of the recession, and whether donor tissue or collagen membranes are used instead of tissue from the patient's palate. When multiple teeth are treated in one session, the per-tooth cost may be lower, but the total cost will be higher.
Dental insurance plans that include periodontal benefits may cover a portion of gum grafting when it is deemed medically necessary (performed to protect the tooth from further damage rather than for cosmetic reasons alone). Coverage varies widely between plans. Check with your insurance provider before scheduling surgery to understand your out-of-pocket costs.
Some periodontists offer payment plans or work with third-party financing companies. Ask about these options during your consultation.
When to See a Periodontist
A periodontist is the right specialist when gum recession requires surgical treatment or when periodontal disease is contributing to the problem. [1]
Your general dentist can monitor mild recession and help you correct habits like aggressive brushing. However, a referral to a periodontist is appropriate when recession is progressing despite behavior changes, when root sensitivity is affecting your daily life, when a tooth root is visibly exposed, or when periodontal disease has been diagnosed alongside the recession.
If your dentist has classified your recession as Class II, III, or IV (or Cairo RT2 or RT3), consulting a periodontist is a reasonable next step. Even for Class I recession (Cairo RT1), a periodontist can provide a detailed assessment and help you decide whether to pursue treatment now or monitor the area over time.
Patients who have noticed their teeth looking longer, who feel a notch near the gum line with their tongue, or who have increased sensitivity to hot and cold foods should mention these symptoms at their next dental visit. [2] These are common early signs of recession that warrant a closer look.
Find a Periodontist Near You
If you have been told you have gum recession, or if you are experiencing symptoms like root sensitivity or visibly longer teeth, a periodontist can evaluate your specific situation. Visit the periodontics page on My Specialty Dentist to search for a board-certified periodontist in your area and learn more about what to expect from a periodontal consultation.
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