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How long does it take tooth enamel to grow back?

Tooth enamel is the hard, outer layer of the teeth. It is the hardest substance in the human body and helps protect the sensitive dentin and pulp inside the tooth. Once tooth enamel is lost due to decay, acid erosion, or trauma, it cannot grow back naturally. This is because enamel-forming cells called ameloblasts are lost after teeth erupt. However, there are some procedures and treatments that may help regenerate a thin layer of enamel or enamel-like material over areas of lost enamel.

Quick answers

– Tooth enamel cannot regenerate naturally once lost, but some treatments may help regrow a thin layer of enamel or enamel-like material.

– It can take several months up to 2 years for new enamel to regenerate with enamel regeneration treatment.

– Factors like the amount of enamel loss, oral hygiene, and patient compliance impact treatment time.

– Most enamel regeneration procedures require multiple treatment visits over an extended period.

– The new enamel layer is not as thick or durable as original enamel but can help protect teeth.

Can enamel grow back naturally?

Tooth enamel cannot regenerate on its own once it is lost. Enamel is produced by specialized cells called ameloblasts which are present during tooth development. When baby teeth (deciduous teeth) fall out, the permanent teeth form with new ameloblasts to lay down the enamel. After teeth fully erupt in the mouth, ameloblasts are lost. This means adults no longer have the cells needed to produce tooth enamel.

There is also no supply of stem cells present around teeth to differentiate into new enamel-forming ameloblasts. While other tissues in the body like skin and bone can regenerate due to having a population of stem cells, teeth do not have this ability.

This is why tooth enamel cannot regenerate naturally if it is lost due to dental caries, acid erosion from drinks or reflux, trauma/injury, or other causes. Any areas of lost enamel will remain that way unless treated professionally.

Can enamel be regrown or regenerated?

While enamel cannot regrow on its own, there are some professional treatment options that may help regenerate a thin outer layer of enamel or enamel-like material over areas of lost enamel. These include:

  • Enamel microabrasion – This polishes off a thin outer layer of enamel to improve appearance and smoothness. It does not regenerate enamel.
  • Remineralization – Fluoride treatments help rebuild some mineral content in weakened enamel but do not regenerate enamel structure.
  • Bonding – Dental bonding material can be applied to help protect areas of lost enamel. This mimics enamel but does not regenerate it.
  • Enamel regeneration procedures – New treatments like calcium phosphate help deposit a thin new layer of enamel over damaged areas. This shows the most promise for true enamel regeneration.

While results may not be as thick and durable as natural enamel, enamel regeneration procedures like calcium phosphate treatment may essentially regrow a thin protective layer of enamel over damaged teeth.

Enamel Microabrasion

Enamel microabrasion is a minimally invasive dental procedure that aims to improve the appearance of teeth with enamel defects. It works by using an abrasive agent like pumice along with an acid like hydrochloric acid to essentially polish off and partially dissolve a very thin outer layer of enamel.

This helps smooth over any rough spots, stains, or discoloration for a more uniform, bright tooth appearance. Enamel microabrasion may take one or several treatment sessions depending on the severity of the enamel issue being treated.

However, it does not actually stimulate regrowth of new enamel – it only removes a tiny amount of outer enamel. Microabrasion may make teeth more susceptible to decay since some enamel is removed. As such, it is important to practice good oral hygiene and use fluoride treatments after microabrasion.


Remineralization refers to the process of restoring mineral content lost from teeth due to demineralization from acid exposure. Common remineralization treatments include fluoride varnishes, gels, rinses, and toothpastes.

When acid hits the teeth, it can dissolve and leach out calcium and phosphate minerals that make up enamel and dentin. Fluoride treatments provide a source of these minerals and deposits them back into weakened areas of enamel and dentin. This helps strengthen teeth against decay and cavities.

However, remineralization does not regenerate the actual structure and crystals that form enamel. It simply replaces some of the mineral content lost. So while it may help strengthen weakened enamel, it does not regrow enamel that has already been completely lost due to cavities or other causes.

Dental Bonding

Dental bonding is a procedure that applies a tooth-colored resin material to the tooth surface to restore areas of decay or damage. The material is sculpted and hardened with a special light. Bonding is commonly used for fixing chips or cracks in the teeth.

Bonding materials mimic the appearance of natural teeth but do not regenerate true enamel. The resin material helps protect areas of lost enamel and dentin but it is softer than natural enamel. Bonding also stains more easily over time and may need periodic replacement.

While bonding can cosmetically improve the look of teeth with enamel loss, it functions more as a patch rather than stimulating growth of new natural enamel.

Enamel Regeneration

Enamel regeneration is an area of focus in current dental research. This involves applying materials, growth factors, or proteins to the teeth to stimulate formation of new enamel over areas that are deficient.

One method uses a calcium phosphate nanoparticle gel that is applied to damaged enamel. This provides calcium and phosphate ions that mimic the natural mineral content of enamel. Early evidence shows the calcium phosphate gel can help regrow a thin layer of enamel over exposed dentin, improving durability and tooth function.

However, the new enamel layer is not as thick or durable as original natural enamel. But it does provide a protective coating for teeth and help prevent hypersensitivity. Enamel regenerated by calcium phosphate gel typically takes multiple treatment sessions over weeks to months to fully deposit.

How long does enamel take to regenerate?

The amount of time it takes for enamel to regenerate or regrow with current treatment options can vary based on several factors:

  • Amount of enamel loss – Small areas of enamel loss may regenerate faster than widespread enamel damage.
  • Treatment method – More involved enamel regeneration procedures take longer than simpler mineralization treatments.
  • Number of treatment sessions – Most enamel regeneration methods require multiple applications over weeks or months.
  • Patient compliance – Following recommended home care between treatments impacts results.
  • Individual variation – Some patients may respond better and faster to enamel regeneration methods.

In general, the timeline for various enamel regeneration approaches is:

Treatment Timeline
Enamel microabrasion 1-2 sessions done weeks apart
Remineralization Weekly to daily treatments for 3-6 months
Dental bonding 1-2 visits done weeks apart
Enamel regeneration (calcium phosphate) Multiple treatment sessions over 3-24 months

As shown above, most enamel regeneration procedures require repeat visits and treatment over an extended period of time. It can take anywhere from several months to 2 years for significant enamel regeneration to occur.

Factors like the severity of enamel loss, patient age, oral hygiene diligence, and compliance with recommended aftercare impact the timeline. More enamel regeneration is likely with younger patients, good oral hygiene, and follow-up with all treatment sessions and home care advice.

Does the new enamel last?

Enamel regenerated through current treatments is not as thick or durable as natural, original enamel. However, studies show the new enamel layer can last:

  • Microabraded enamel remains intact for over 10 years in most patients.
  • Remineralized enamel may last 5-10 years with proper oral hygiene.
  • Bonded resins last 5-10 years before needing replacement.
  • Regrown enamel with calcium phosphate can last at least 2 years based on current research.

While longevity is limited compared to natural enamel, some level of enamel regeneration can still help protect teeth for years before needing retreatment. Using good oral hygiene, avoiding enamel erosion, and getting periodic touch-up treatments can help extend the results.

Does enamel regeneration improve tooth appearance?

Depending on the type of enamel loss or damage, enamel regeneration may provide aesthetic benefits as well as restoring tooth function.

Smoothing over defects like white spot lesions, cracks, roughness, and intrinsic stains can improve tooth color and appearance. Enamel microabrasion and dental bonding are common ways to cosmetically enhance teeth.

Regrowing a protective coating of enamel with calcium phosphate can also mask unsightly areas of exposed yellow dentin. This gives a more pleasing white appearance.

However, enamel regeneration may not fully restore badly damaged or decayed teeth aesthetically. Other approaches like dental crowns or veneers may be needed for significant tooth flaws. Discuss goals with your dentist to determine if enamel regeneration can improve appearance based on the type of enamel loss present.

Can enamel regeneration prevent cavities?

Some benefits of enamel regeneration include:

  • Strengthens enamel – Remineralization and regrown enamel make enamel more resistant to acid and decay.
  • Reduces sensitivity – New barrier over dentin protects nerve endings and reduces sensitivity to hot/cold.
  • Covers exposed areas – Regrown enamel creates a protective coating over weak spots.
  • Enhances appearance – Smoother, whiter, more uniform looking teeth.
  • Avoids more invasive treatments – Reduces need for crowns, veneers, etc.

In particular, regrowing a layer of enamel or enamel-like material can help prevent cavities and tooth decay. The new enamel provides a physical barrier over exposed dentin, sealing off pathways for bacteria and acid to penetrate. This allows remineralization and avoids new decay.

However, enamel regeneration alone does not prevent all cavities – practicing good oral hygiene, limiting sugary/acidic foods, using fluoride, and getting regular dental cleanings are still needed to protect teeth.


While permanent tooth enamel cannot regenerate naturally, current treatments like calcium phosphate have shown promise for regrowing a thin enamel layer over areas of damage. This regenerative process typically takes months to years depending on the severity of enamel loss and requires multiple treatment sessions.

The new enamel produced is not as thick or durable as original enamel but does offer protection against sensitivity, decay, and can have aesthetic benefits. Enamel regeneration may be an option for restoring some function for teeth with significant enamel deficiencies.

Ongoing home dental care and good oral hygiene remains essential for maximizing the longevity of regenerated enamel. Regular dental visits allow dentists to monitor the new enamel and repeat treatments as needed. While still an emerging field, enamel regeneration represents an exciting new frontier in the evolution of dental care and tooth restoration.