What Is The Cause Of Tooth Decay Despite Brushing?

What Is The Cause Of Tooth Decay Despite Brushing?

Table of Contents


Tooth decay is one of the common problems of human societies. About the causes of tooth decay, there are always some clichéd questions in people’s minds: Why do my teeth still decay even though I brush my teeth every day? 

But are there those who have perfectly healthy teeth without any care? Why do mothers’ teeth decay during pregnancy and breastfeeding? And… the simplistic answer that everyone has for questions like this is the same: the problem is the “sex” of the tooth!

But how true is this claim? Can the root of all dental problems be found in the type of teeth and heredity?

Although brushing is one of the important care measures to maintain the health of the teeth and oral health, it alone cannot protect the teeth and eliminate the role of other factors that influence tooth decay.

Many factors have a role in tooth decay, which we discuss in this article. We will also talk about the effect of genes on dental health and the indirect connection of these genes with oral and dental problems.

Understanding tooth decay: beyond brushing techniques

Most foods used during the day have a lot of sugar, which is the main reason of nutrition for dental bacteria. 

One of the causes of tooth decay is unnatural sugar. By consuming sugary substances, bacteria produce an acid that destroys tooth enamel and causes decay and cavities on the tooth’s surface. 

Researchers have reached a general conclusion by conducting various tests on this bacterium in people with similar DNA.

Wisdom tooth decay through this bacterium has no genetic aspect. Therefore, a person’s way of life, brushing teeth, personal hygiene, and food consumption are among the most important factors of decay and increase of bacteria in teeth.

The way teeth grow directly affects decay. Teeth that do not complete their growth period or do not have resistant tooth enamel also cause tooth decay; Genes will directly influence these.

Deeper diving: Factors that cause tooth decay despite regular brushing

The connection between the toothbrush and tooth decay is that by brushing after each meal and consuming sweets and chocolate, the food stuck to the tooth’s surface is separated, and the possibility of tooth decay is reduced.

In response to people who doubt the relationship between toothbrushes and tooth decay and claim that despite brushing daily, they still have decayed teeth, we must say that although brushing is a good preventive measure. 

There is a connection between brushing and tooth decay, this Action alone cannot prevent tooth decay.

In other words, the reason for tooth decay is not only food remaining on the tooth, which we can control by brushing But other factors are also involved in the tooth decay process.

The most important factors causing tooth decay include the following.

  1. The effect of genetics on tooth decay

Most of the diseases we get are genetic; Tooth decay is no exception to this rule. Of course, we must consider that the tooth decay gene is not directly transmitted from parents to children.

Rather, the cause of oral and dental problems and tooth decay is passed from parents to children, and even though a person brushes his teeth and observes oral hygiene, he still suffers from tooth decay and has to pay for the treatment of damaged teeth.

In short, the relationship between the cause of tooth decay and genetics causes many diseases in the body, which are sometimes expensive to treat. 

Even if a person has a habit of brushing, flossing, and brushing, genetics plays a key role in the health of his teeth. In general, 60% of caries are caused by genetic factors.

The relationship between toothbrush and tooth decay is influenced by genetics. However, it does not mean that a person with genetics of damaged teeth has reached a dead end or does not need to take appropriate preventive measures. Rather, these people must take other oral and dental care seriously.

  1. Not going to the dentist and its effect on tooth decay

We all know that brushing twice daily with fluoride toothpaste effectively stops tooth decay. However, visiting the dentist regularly is an important care measure that impacts the relationship between toothbrushes and tooth decay.

Every person should see a dentist every six months so tooth decay can be detected in the beginning phases and correct treatment can be done. 

Delaying or not taking the visit to the dentist seriously causes tooth decay to reach the nerves and the cost of treatment increases.

  1. The effect of oral and dental problems in causing tooth decay

To investigate the causes of tooth decay despite brushing, we must also pay attention to the impact of oral and dental problems and diseases. 

Problems such as crooked teeth or their lack of full growth, premature growth of baby teeth, and crowded teeth are the most common oral and dental problems that cause tooth decay, and brushing alone cannot prevent tooth decay.

For this reason, it is recommended that those with oral and dental problems go to an orthodontist as soon as possible and treat gum or jaw problems to strengthen the positive relationship between brushing and tooth decay.

  1. The effect of improper nutrition on tooth decay

One of the common complaints about tooth decay is that despite brushing, the plaques move toward the tooth enamel and destroy it. 

In order to investigate the factors that affect tooth decay and the relationship between toothbrushes and tooth decay, we must also examine the role of nutrition.

No matter how seriously a person takes brushing his teeth, he cannot prevent tooth decay if he does not pay attention to the correct way of eating. 

By following a healthy and balanced diet, you can provide the nutrients the teeth need and prevent damage to the tooth enamel.

    • Lack of which vitamins cause tooth decay?

The presence of some vitamins in the body is very important for the health and strength of the teeth, and especially this deficiency in children leads to serious problems related to the mouth and teeth.

Vitamin A in the diet can protect the health of teeth and gums by preventing dry mouth. Also, the presence of sufficient amounts of vitamin D allows calcium to be sufficiently absorbed by the body, and the rate of tooth decay decreases.

For example, the use of dried fruit, candy, chocolate, cookies, chips, sweets, ice cream, and other sweet and processed foods can increase the possibility of tooth decay and damage to tooth enamel. 

Those who want to take care of their teeth should consume More fruits and vegetables so that by increasing saliva, they can increase the possibility of rebuilding tooth enamel.

Also, increasing the consumption of dairy products by providing calcium needed by the body can be effective in strengthening teeth and reducing the possibility of tooth decay. 

Be careful that carbonated drinks are also effective in causing tooth decay and should be removed from the daily diet to protect the teeth.

  1. The effect of smoking on tooth decay

Although toothbrushes and tooth decay have a lot to do with each other, smoking is an inappropriate habit that reduces the effectiveness of brushing and causes decaying and yellow teeth.

Smoking reduces the amount of blood flow in the mouth and wears the teeth, and the protective coating of their enamel is lost.

  1. The effect of some diseases in causing tooth decay

To check the relationship between toothbrushes and tooth decay, we must also check the diseases that increase the possibility of tooth decay. 

Teeth Pain, increased sensitivity of the teeth, or the appearance of spots on them may be due to certain diseases or the use of certain medications.

For example, those with asthma take medications that reduce the amount of saliva and increase the risk of tooth decay. 

Considering that brushing alone is not enough to take care of these people’s oral and dental health, they should not neglect oral and dental care. 

  1. Brushing incorrectly

People of any age may experience bleeding from the gums when brushing their teeth or feel a bitter taste and bad breath in their mouth; they may even be offended by eating very cold or hot foods and drinks. These symptoms show that tooth decay is spreading.

One of the important measures that controls the rate of tooth decay and impacts the relationship between toothbrush and tooth decay is brushing with toothpaste, which contains fluoride. 

The reason for emphasizing the use of toothpaste containing fluoride is that fluoride strengthens tooth enamel and prevents it from breaking.

The cause of wisdom tooth decay despite brushing

Wisdom tooth decay is common, and the reason for this is not brushing properly and consuming alcoholic beverages or unhealthy foods. Of course, the main reason for wisdom tooth decay is the accumulation of mass on this tooth compared to other teeth. 

Also, due to their deep position inside the mouth, more plaque is formed on it during the day and night.

As a result, wisdom tooth decay occurs very quickly. But if a person regularly practices brushing his teeth and watches for decay. Therefore, there is no reason other than the wrong way to brush your teeth.

Related: “Pain In Wisdom Tooth – Get Rid Of It Forever

The cause of front tooth decay despite brushing

The types of damage to the front teeth are similar to the back teeth and create cavities, ultimately leading to the types of front tooth decay. In adults, the types of front tooth decay are not different from back teeth, and the reason for this can be the following:

  • Genetics
  • The presence of certain diseases
  • Consuming drinks and foods containing high acid and sugar content
  • Flossing
  • Brushing wrong
  • Fluoride deficiency
  • Gastric acid reflux
  • Food and food stuck in the teeth

Prevention of tooth decay despite brushing

Effective strategies to prevent tooth decay other than brushing alone

Prevention is always better than cure. Apart from genetic factors, a large percentage of the probability of tooth decay depends on us. 

Maintaining oral hygiene and having a healthy diet is one of the easiest ways to care for teeth.

  • See the dentist at certain times.

Undoubtedly, a dentist is the only person who can help you keep the health of your teeth and mouth and prevent decay. 

Therefore, visiting the dentist regularly and twice a year can guarantee the health of your teeth and mouth.

It also helps you prevent caries and other dental problems. Of course, methods such as fluoride treatment, dental scaling, and regular checkups can provide proper function for your teeth and mouth over the years.

  • Healthy diet

A healthy and balanced diet plays an effective role in all aspects of health, especially dental and oral hygiene. Foods that are naturally stuck between the teeth for a long time expose the tooth to decay.

These foods include dried fruit, candies, cookies, chips, etc. Of course, sweet and processed foods are not exempt from this rule. But fresh fruits and vegetables are good snack choices and even main meals. 

Because these materials help rebuild tooth enamel and increase saliva flow. Therefore, the stronger and healthier the tooth enamel is, the less chance of tooth decay.

  • Compliance with oral hygiene

One of the ways to eliminate tooth decay is brushing with fluoride toothpaste. Therefore, teeth should be cleaned 1-2 times a day with a soft toothbrush because a soft toothbrush prevents the teeth from rubbing together.

Of course, the correct way of brushing is important, and you should clean the teeth without any special force or pressure Because brushing too often destroys the tooth enamel and exposes the dentin in the mouth, which increases decay. 

Also, the fluoride in the toothpaste strengthens the tooth enamel, which is a way to prevent tooth decay.

What is the cause of tooth decay despite brushing? 

Nutrition and genetics are two important causes of tooth decay. 

To know the extent of genetic influence on this issue, there are genetic tests that examine the genes that affect tooth decay.

Does brushing damage teeth?

One frequently asked question about the relationship between toothbrushes and tooth decay is the role of brushing in causing tooth enamel damage. 

It is better to know that although brushing your teeth is an effective preventive measure against tooth decay if done incorrectly, it provides the basis for decay. Brushing your teeth violently provides conditions for wearing down the enamel and exposing the underlying dentin.

Do teeth decay despite brushing?

Sometimes, people go to the dentist who may brush their teeth three times a day, But they still have rotten teeth

The point here is that how to use a toothbrush is an important condition for dental hygiene. Sometimes, brushing your teeth once a day in the right way and for a long period is better than brushing your teeth wrongly three times a day. 

Besides the toothbrush, dental floss should not be forgotten because dental floss complements dental hygiene with a toothbrush. Generally, when a patient spends 10 to 15 minutes brushing and flossing daily, he will have healthy and clean teeth.

Is tooth type effective in the prevalence of tooth decay despite regular brushing?

No, everyone’s teeth are the same. Only the chemical structure of teeth is different in people.

With a little care, in the patients who go to the dentist, this prediction is that because my mother or father had teeth like mine or the water from traveling has come into contact with them, it has caused decay. 

At the same time, as it was said, the type of teeth of all people is generally the same. And inheritance cannot be considered effective. Of course, in medical science, an option such as inheritance affects the teeth. 

However, the percentage of its effectiveness is very limited and low, and the common reason is related to lack of hygiene. Some people in society believe that their bad sex causes the decay of their teeth. This group believes that their teeth are made of plaster and consider their cleaning useless. 

Examining the teeth of these people shows that the type of their teeth is not much different from other people. The reason for the deterioration of the teeth of this group is the lack of awareness or not observing the health, nutrition, and treatment points.

On the other hand, scientific research has shown that a little or a lot of tooth minerals do not have much effect on the beginning of their decay. Also, these two factors do not play a decisive role in tooth decay, as this group thinks.

Do decayed milk teeth affect the future of permanent teeth?

This also depends on the severity of the decay, in the sense that if the severity of the decay is very severe and turns into an infection and affects the tooth bud, it will affect the permanent teeth. Otherwise, surface decay can be treated to ensure the health of future and permanent teeth.

Why do some people have healthy, decay-free teeth despite minimal oral health care?

This issue is related to people’s genetics because people with gapped teeth cause less food to accumulate and stay behind their teeth, and these people can easily remove food from their teeth even with a toothbrush. 

But for people who suffer from caries, this issue is related to teeth that are stuck together and have no space.


We should know that observing oral hygiene is the first way to prevent tooth decay. Tooth decay, despite brushing, can be due to the genetic relationship of each person, reduction of minerals such as calcium, potassium, etc., in the body and teeth, drinks, sticky and sugary foods that help bacteria produce more acid and as a result, They speed up the process of tooth decay. 

These inherited genes cause crooked teeth, and the use of certain drugs that prevent the secretion of saliva by drying the mouth and other reasons such as stress, nutrition, and smoking are among the causes of tooth decay. Despite brushing teeth, it should not be underestimated.

By understanding the reasons that will cause tooth decay despite frequent brushing and following the solutions provided in this valuable article, the smile caused by healthy teeth will be on your lips forever.

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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.