A suffering young man thinking about causes of bad breath
Badge field

What Causes Bad Breath?

Published date field Last Updated:
Published date field Last Updated:

Medically Reviewed By Colgate Global Scientific Communications

Maintaining optimal oral health is essential for both personal well-being and social interaction. One common yet often overlooked aspect of oral health is halitosis, more commonly known as bad breath. This article will explore the causes of bad breath and how to fight it, thus enabling you to address this issue effectively.

What is Bad breath?

Halitosis, better known as bad breath, is a common oral condition that affects many individuals at some point in their lives. It is characterized by an unpleasant odour originating from the mouth, which can be temporary or persistent. The reason for bad breath can vary, ranging from poor oral hygiene to certain medical conditions.

While bad breath may be uncomfortable and potentially embarrassing, it is generally not a serious medical concern on its own. However, in some cases, it can indicate an underlying health issue that may require attention. Addressing halitosis often involves maintaining good oral hygiene practices and adopting lifestyle changes, but in persistent cases, seeking professional dental healthcare or medical advice may be necessary.

What Causes Bad Breath?

Understanding the most common causes of bad breath is important for identifying the source and taking appropriate steps to freshen your breath. From gum disease to poor oral hygiene habits and medications, numerous potential culprits exist behind bad breath reasons. This can lead to several dental issues, like halitosis, oral cavity and gum disease. Let's explore some of the most prevalent mouth smell reasons.

Gum Disease

According to the Indian Dental Association, gum disease and tooth decay are the major causes of halitosis. Gum disease, also known as gingivitis or periodontal disease, occurs when plaque and bacteria accumulate around the gum line, causing inflammation and infection. Plaque is a sticky film containing bacteria that forms on teeth if not removed through proper brushing and flossing. As the disease progresses, pockets form between the gums and teeth, trapping food particles and bacteria, leading to bad breath.

Tonsil Stones

Tonsils at the back of the throat contain tiny pits that can trap food debris, dead cells, and mucus. Over time, these trapped particles can harden into white or yellow tonsil stones. Bacteria love to grow on these stones, and as they break down the debris, they release unpleasant odours that contribute to bad breath. Tonsil stones causes bad breath, especially if they become dislodged and remain in the mouth.

Tobacco Products

Smoking cigarettes, cigars, or chewing tobacco not only stains teeth but also irritates the gums and dries out the mouth. The irritation and dryness create a breeding ground for bacteria that produce bad breath. Additionally, the chemicals in tobacco itself can leave a lingering, unpleasant odour.

Oral Hygiene

Dental hygiene plays an important role in controlling bad breath. Brushing your teeth twice daily and flossing once daily removes food particles and plaque buildup. If you skip these practices, food debris and bacteria can accumulate in your mouth. As bacteria break down this debris, they release gases that cause bad breath. Failing to clean the back of the tongue, where bacteria can thrive, can also contribute to unpleasant mouth odours. Regular dental cleanings by a professional are also crucial for removing plaque and tartar buildup that brushing and flossing can't reach, helping to prevent bad breath. 

Dry Mouth

Dry mouth, or xerostomia, occurs when there is a lack of enough saliva production. Saliva plays a crucial role in washing away food particles and neutralizing acids produced by bacteria, helping to prevent bad breath. Certain medications, radiation therapy, salivary gland problems, and medical conditions can cause dry mouth.

Infection in Your Mouth

Infections in the mouth, such as oral thrush (a fungal infection), abscesses, or other types of mouth sores, can lead to a distinctively unpleasant breath odour. These infections can also contribute to the growth of bacteria that cause bad breath. Additionally, some infections can cause a post nasal drip, contributing to bad breath.

Medicines

Certain medications, such as those used to treat high blood pressure, anxiety, or depression, can cause dry mouth as a side effect, leading to bad breath. Additionally, some medications can release chemicals that contribute to unpleasant mouth odours.

Other Causes

Other potential causes of bad breath include health problems like metabolic disorders like diabetes, liver or kidney disease,  acid reflux (GERD) and certain foods like garlic, onions, or certain spices. Crash diets and low-carbohydrate diets can also contribute to bad breath due to the byproducts produced during the breakdown of fats. If you suspect an underlying medical condition might be causing your bad breath, consult with a doctor.

How You Can Fight Bad Breath?

Knowing how to get rid of bad breath is about creating a healthy environment in your mouth. Brushing twice daily with fluoride toothpaste, flossing once a day, rinsing with mouthwash, and regularly cleaning your tongue with a toothbrush or a tongue scraper are the cornerstones of good oral hygiene. This routine removes food particles and plaque buildup, preventing bacteria from thriving and producing unpleasant odours. 

You may consider using a toothpaste that addresses bad breath daily, like Colgate Total Advanced Health. Only 20% of the germs in your mouth are on your teeth, and the rest, 80%, are on your gums, tongue, and cheeks. Colgate Total Advanced Health is an antibacterial toothpaste that employs Dual Zinc + Arginine technology to fight germs for 12 hours on teeth, tongue, cheeks, and gums, giving you fresh breath and whole-mouth health.

Beyond oral hygiene habits, there are other lifestyle factors to consider. Staying hydrated with plenty of water keeps your mouth moist and flushes away food particles that could contribute to bad breath.  Making mindful dietary choices can also help. Limiting your intake of strong-smelling foods like onions and garlic reduces their breakdown into unpleasant odours. If you smoke or use tobacco products, quitting is a significant step towards fresher breath. Tobacco products not only irritate gums and dry out the mouth, but the chemicals themselves can leave behind lingering odours.

Regular dental checkups and cleanings are also crucial. Professional cleanings remove plaque and tartar that brushing can't reach, further reducing bad breath and identifying any underlying dental issues. In some cases, bad breath can be a sign of an underlying medical condition. Early diagnosis and treatment can help address the root cause and keep your breath fresh.

When to See a Medical Professional?

While maintaining good oral hygiene is key to fresh breath, there are situations where consulting a medical professional becomes necessary for bad breath treatment. Persistent bad breath, unusual odours, or accompanying symptoms can all be signs of underlying issues. These are some key situations where seeking professional help is recommended for tackling bad breath.

  • Persistent bad breath: If you've consistently tried to improve your oral hygiene and bad breath persists, it's a sign that something else might be at play. A doctor or dentist can help identify underlying medical conditions that could be contributing to the problem.

  • Unusual odours:  Bad breath typically has a mildly unpleasant odour. However, noticing a significantly foul or fruity smell could indicate a specific medical condition, like diabetes or liver problems. Consulting a doctor can help determine the cause.

  • Other symptoms:  If bad breath is accompanied by other symptoms like a sore throat, dry mouth, postnasal drip, or mouth ulcers, it could point towards an underlying issue. Seeing a doctor can help diagnose the root cause and recommend appropriate treatment.

  • No improvement after dental treatment:  If you've undergone dental cleanings and addressed any oral hygiene issues but bad breath remains, consult your dentist again. They might recommend further examination or refer you to a doctor to evaluate other potential causes of bad breath.

Bad breath can be embarrassing and unpleasant, but it's often preventable and treatable. Understanding how to prevent bad breath starts with proper oral hygiene, including regular brushing, flossing, and tongue cleaning, which are crucial for keeping your breath smell fresh. However, if bad breath persists despite good oral care, it may indicate an underlying medical condition that requires professional attention from a dentist or doctor. Understanding the various causes of bad breath and taking appropriate measures can effectively combat this issue, enjoy fresher breath, and improve your oral health.

Frequently Asked Questions

1. What is the main cause of bad breath?

The main causes of bad breath, or halitosis, is the buildup of odour-producing bacteria in the mouth. These bacteria thrive on food particles and plaque on teeth, gums, and the tongue. Poor oral hygiene, certain foods like garlic and onions, smoking, and a dry mouth can worsen the problem​.

2. Can bad breath come from the stomach?

Yes, bad breath can sometimes originate from the stomach. Health conditions such as gastroesophageal reflux disease (GERD) can cause stomach acids to flow back into the oesophagus, leading to bad breath. Additionally, certain metabolic disorders and stomach infections can be the reason for bad breath.

3. Can iron deficiency cause bad breath?

Iron deficiency is not a direct cause of bad breath. However, it can lead to conditions like mouth sores and gum disease, which contribute to bad breath. Additionally, iron deficiency can cause anaemia, leading to dry mouth and reduced saliva production, which may also result in bad breath.​ 

4. Why do I have bad breath even after brushing?

Persistent bad breath after brushing can occur due to inadequate brushing (especially not cleaning the tongue), gum disease, mouth infections, dry mouth, certain foods, or underlying medical conditions like sinus infections or GERD​. Consult a medical professional for a detailed checkup.