Decay under filling 12

Decay under filling

Table of Contents

Decay under filling is a common occurrence that often surprises people who have previously had their teeth filled. So people who have repaired their teeth may have this ask from dentists we need to replace the filling of our teeth.

In general, there is no reason to replace the fillings of restored teeth, but like natural teeth, these teeth may also suffer from damage means decay under filling, and it is necessary to be examined by a dentist during six-month checkups.

Causes of Decay under filling

  1. Lack of proper oral hygiene
  2. previous and deep caries in the teeth
  3. low-quality dental materials
  4. excessive pressure on weakened teeth
  5. carelessness or inattention to the dentist
  6. gum recession
  7. a large extent of previous tooth filling, etc.
can cause decay under the filling that needs to be repaired again.

Of course, sometimes people may want to replace the non-same-colored amalgam restorations of their teeth with the same-colored restorations, that is, composite restorations, in which case they must consult their dentist. 

It is necessary to say that dentists fill the tooth when the tooth tissue is weakened due to decay. Those parts of the tooth that are wasted are removed and filled with unique dental materials.

Related: “Tooth And Ear Pain On The Same Side

Note that tooth filling materials, Even if it is one of the best dental materials, it still does not reach the resistance and strength of a person’s original tooth. Therefore, decay under filling will be a possibility.

َAlso note that a damaged and decayed tooth will deteriorate daily if it is not repaired on time ( In that regard, reading the article “The Teeth Implants Revolution” would be beneficial)

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I must emphasize to you that; Note that it is necessary to take care of teeth, both healthy teeth and restored teeth. ( It is recommended to read the article “Points To Pay Attention To After Teeth Restoration” )

Decay hides itself to trouble you !!!

You should know that when you fill your tooth, there will come a time when you have to change the packing. 

Old dental fillings cause many problems and may cause you to lose your tooth. 

Therefore, you should not wait for the toothache to bring you to the dentist, but you should visit the dentist at least once a year and take pictures to ensure that there is no problem with the teeth that have been filled for a long time. Because decay under the filling is a common occurrence.

( You may be interested in the “Tooth Pain, No Cavities” article.

Reasons for filling the filling

Interesting to know that No dental restoration is lifelong, and you should know the useful life of your dental restorations to check them in time. The following factors are the most important reasons for the need to replace dental fillings:

  • Symptoms of tooth decay

If the dentist notices signs of decay under filling during the dental examination, he recommends immediate treatment and replacement. 

It may progress and reach a pulp if you do not treat caries in time. And even leads to infection ( If you are faced, read the article “Treatment Of Tooth Infection Swelling“). In this case, you will need nerve extraction, and if you do not take action, you will get an infection and lose the tooth.

And I must add that decay under filling commonly occurs in the tooth. Over time, the filling separates from the tooth and creates microscopic seams between the tooth and the restoration. In such conditions, food particles and bacteria enter it. 

Bacteria work by feeding on food particles and producing acid. Acid leads to the loss of tooth structure. 

Caries may be difficult to detect because the restoration covers the filled tooth on a routine examination. 

For this reason, to ensure the health of the repair, an X-ray photo should be taken to better estimate the tooth’s health.

Related: “How Do I Know What Kind Of Toothache I Have?

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  •  Cracked or full lips

If the tooth is subjected to a lot of pressure or undergoes contraction and expansion many times, the silver amalgam restorative materials may crack or fill the lip. Any tooth restoration that is broken should be replaced. Otherwise, it can even lead to tooth sensitivity to cold or hot.

Related: ‘What To Do With Tooth Sensitivity

A piece of the repair may break off and be accidentally swallowed. Cracks are also a good place for bacteria to penetrate and cause decay. 

Therefore, if a crack is observed in the filling, it must be replaced. ( It is recommended to read the article “Tooth Infection Swelling“.)

People who have habits such as grinding their teeth and clenching their teeth, chewing complex objects such as pencils, chewing ice, biting nails, etc., are more exposed to this problem and should visit the dentist more often to check the condition of their teeth.

Related: “How Do I Know What Kind Of Toothache I Have?

  • Filling leak

As mentioned, the filling may separate from the tooth over time, and a small space may appear between them. 

In this case, particles, saliva, and bacteria enter this space. This situation is called dental filling leakage. 

Finally, this leads to the vulnerability of the tooth against pressure and increases the possibility of tooth fracture and decay under filling. Therefore, the leaky filling must be replaced before these problems occur.

  • The aesthetic aspect of teeth

Sometimes, patients ask for translations to make some teeth that have already been filled with amalgam more beautiful because they are occasionally exposed. 

To make the teeth more beautiful, metal fillings can be replaced with tooth-colored materials (composite resin).

Related: “How To Laminate Teeth And How Long Does It Work?

  • allergy

People who are allergic to the materials used in their dental restorations should have their dental fillings replaced. 

Although allergy to amalgam is rare, it can be seen in some people. These people can fix the problem by replacing their amalgam filling.

When the silver filling needs to be replaced, it starts to crack and separate from the tooth. 

In more severe cases, a large crack may be created in the restoration, or the entire tooth may break due to its structural weakness.

The life of the materials used in filled teeth depends on what factors?

To heal a decayed tooth, the dentist removes the decayed part of the tooth and then fills the previous decayed area. 

Fillings are also used to repair broken or decayed teeth and teeth damaged by misuse (such as breaking complex objects with teeth or biting nails). 

Related: “The Teeth Implants Revolution: A Guide to a Beautiful, Healthy Smile

Do fillings wear down over time?

Fillings can wear down over time due to various factors, including chewing patterns, grinding habits, and dental habits. 

The materials used in fillings vary; some are more resistant to wear than others. Additionally, the placement and shape of the filling can affect its durability.

As fillings accumulate wear and tear, they can crack, weaken, or fall out, leaving the underlying tooth structure vulnerable to decay or other problems.

The lifespan of a tooth filling depends on the dentist who performed the filling, the extent of damage caused, and how you care for your teeth. 

Some people who have previously had their teeth filled may need to replace and refill them due to fracture, decay under filling teeth, or lack of adequate oral hygiene such as brushing and flossing.

Related: “Tooth Pain, No Cavities, Treatment, And Remedies

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In conclusion, the phenomenon of decay under filling is a widespread dental issue that is not only aesthetically unpleasant but can also have consequences for a patient’s dental health, including pain, infection, and even tooth loss. 

So, it is vital to be aware of the signs and symptoms of decay under filling and to take action early to prevent further damage to their teeth.

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Author and specialist

Dr. Majid Zahrabi,


  • Board Certified Neurosurgeon
  • DHA certificate holder
  • Plantation certificate holder, France
  • Certified holder of Discogol, France
  • A pioneer in the non-surgical treatment of disc herniation in the Middle East and CIS countries.
  • Under the training and coaching of Professor Jacques Theron (founder of Discogel Therapy) since 2008
  • More than 400 successful cervical and 1300 lumbar discogel injections
  • Trained and certified several neurosurgeons and spine surgeons in the Middle East and CIS countries for the treatment of Discogel
  • Strong belief in patient-centered care planning and participation
  • Neurosurgeon and spine surgeon at Imam Khomeini and Amir Mazandarani Hospital, Sari, Iran, with more than 430 surgeries annually, 2000-2011
  • Neurosurgeon and spine surgeon at Farmaniyeh, Nikan and Yas Sepid Hospital, Tehran, Iran, with more than 400 surgeries annually, 2011-2012
  • Neurosurgeon at Iranian Hospital, Dubai, 2022-2023
  • Since 2015, he has been working as a reference doctor for the treatment of intervertebral disc herniation with Discogel and has trained many doctors of spine-related specialties in various countries of the Middle East and CIS in person/practically and online.



  • Individual training sessions under the direct supervision of Professor Jacques Theron in Discogel treatment, 2008-2020
  • Training sessions under the supervision of Professor Thierry Boye on spinal implants, 2007
  • Participation and presentation in several national and international medical and neuro-spinal conferences
  • Board certificate by Iran Neurosurgery Board, 2001
  • Neurosurgery assistant training course, Isfahan University of Medical Sciences, Isfahan, Iran, 1996-2001 (In 2001, he graduated from Isfahan University of Medical Sciences with the first rank in the country.
  • His thesis the titled:The Application of human amniotic membrane in repair of dura matter in dogs.” ( It was happening for the first time in the world. )
  • General medical education, Tabriz University of Medical Sciences, Tabriz, Iran, 1984-1993


Published books:

  • CT scan of the brain for doctors
  • Etiology and treatment of painful spine disorders
  • Atlas of diagnosis, prevention, and treatment of spine disorders
  • The most common mistakes in the treatment of spinal disorders
  • Reading brain CT scan in simple language (3rd place in the book of the year)
  • Treatment of head and spine injuries

Publications and articles:

  • Bacteriostatic and bactericidal effects of DISCOGEL® (https://www.researchgate.net/)
  • Muscle recovery, reduction of pain, and improvement of movement strategies in patients with lumbar discopathy after injection of Discogel.
  • The article on the initial results of the treatment of intervertebral disc herniation with discogel injection, which won the second-best poster rank at the Pan Arab International Congress of Interventional Radiology (March 14-16, 2015) and was accepted for presentation at the Chicago Pain Congress.
  • The use of human amniotic membrane in dura mater repair in dogs, a study for the first time in the world.



  • Annual Congress of Physiotherapists of Iran, 2019
  • Chicago International Pain Congress, 2019
  • Iran International Pain Management Congress, 2018
  • Annual Congress of Physiotherapists of Iran, 2018
  • Presentation of Discogel as an innovative solution for the treatment of spinal disc herniation in Armenia for orthopedic specialists and neurosurgeons, 2017
  • First Live Workshop and Seminar on Minimally Invasive Disc Therapy (DISCON), 2017
  • Presentation of Discogel as an innovative solution for the treatment of spinal disc herniation in Azerbaijan for orthopedic specialists and neurosurgeons, 2016
  • Seminar of Iranian official managers, 2016
  • Presentation of Discogel as an innovative solution for the treatment of spinal disc herniation in Tajikistan for orthopedic specialists and neurosurgeons, 2016
  • International Neurological Intervention Congress in Iran, 2014
  • Educational seminar for nurses on treatment approaches for head and spine trauma, 2014
  • Educational seminar for general practitioners on treatment approaches for head and spine trauma, 2014
  • Speech at the Retraining Seminar for General Practitioners and Specialists in Dubai (Discon) in 2017
  • Speech in the internal retraining courses of Irani Hospital, Dubai
  • Holding lecture sessions and practical workshops on the treatment of intervertebral disc herniation with discogel injection in Azerbaijan, Tajikistan, Ukraine, Oman, and Armenia during the years 2015 to 2021.
  • Giving a lecture and holding a practical workshop for neurosurgeons in Vietnam at Ho Chi Minh City University in 2023

Dr. Majid Zohrabi started treating his patients in Dubai in 2022 and continues his activities in private medical centers in the UAE.