
Nail biting is a common habit that often begins in childhood, with many children outgrowing it as they get older. However, some people continue to bite their nails into adolescence and adulthood, and it can be challenging to break the habit. Nail biting can have various negative side effects, including dental problems, deformed nails, and introducing germs into the mouth that can cause illnesses. It can also be a sign of underlying psychological or emotional issues. Understanding the triggers behind nail biting, such as stress, boredom, or anxiety, is crucial for those looking to quit. Treatment options include cognitive-behavioral therapy (CBT) and acceptance and commitment therapy (ACT), which can help address the psychological aspects of the behavior.
| Characteristics | Values |
|---|---|
| When does nail biting start? | Nail biting typically begins in childhood and can continue through adulthood. |
| Why do people bite their nails? | Nail biting is a coping mechanism in response to feeling nervous, bored, lonely, or hungry. |
| Is nail biting a sign of a psychological problem? | Yes, nail biting is commonly associated with emotional or psychological problems. It may be a sign of a more serious psychological or emotional problem. |
| What are the side effects of nail biting? | Repeated nail biting can make the skin around your nails feel sore and can damage the tissue that makes nails grow, resulting in abnormal-looking nails. It can also spread germs and harmful bacteria and viruses from your hands and fingers to your mouth, increasing your risk of getting sick. |
| How to stop biting your nails? | Identify your triggers and replace nail biting with another activity like chewing gum, squeezing a stress ball, or using a fidget spinner. Keep your nails trimmed and apply bitter-tasting nail polish to discourage nail biting. |
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What You'll Learn

Nail biting is a habit that can be hard to break
The first step to breaking any habit is understanding how it formed in the first place. Nail biting is a classic example of the formula that governs habit formation: a consistent cue, a simple behaviour, and a reward. Your nails are always there, and biting them is easy, but somewhere along the way, you attached a reward to the behaviour—perhaps as a way to cope with challenging emotions.
So, how do you break the habit? The first step is to identify your triggers. Take note of the times and places you're most likely to bite your nails. Even if a trigger is unavoidable, knowing it exists can make it easier to resist the urge to bite your nails. Common triggers include situations that make you feel nervous, bored, lonely, or hungry.
Once you've identified your triggers, you can work on managing them. You can also try to replace nail biting with another activity. Instead of biting your nails, try using a fidget spinner, squeezing a stress ball, playing with silly putty, taking a walk, or chewing gum (although be careful not to overdue it, as this can lead to dental or jaw problems). You can also keep your nails trimmed short and apply bitter-tasting nail polish to make biting them less appealing.
If you can't break the habit on your own, cognitive behavioural therapy (CBT) can help you identify unhelpful behaviour patterns and replace them with different behaviours. Acceptance and commitment therapy (ACT) and habit-reversal training can also be effective in addressing the psychological aspects of nail biting.
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It can spread germs and increase the risk of infection
Nail biting is a habit that often begins in childhood, and while some people outgrow it, it can become a lifelong practice. It is usually a coping mechanism in response to feeling nervous, bored, lonely, or hungry, and is commonly associated with emotional or psychological problems.
Nail biting can spread germs from your hands and fingers to your mouth, increasing your risk of getting sick. This has become an even more serious concern since the COVID-19 pandemic, as it is now more apparent how many different things and surfaces we touch every day. Biting your nails can also spread harmful bacteria and viruses from your mouth to your fingers and from your nails to your face and mouth, leaving you vulnerable to infection.
To prevent the spread of germs and reduce the risk of infection, it is important to break the nail-biting habit. This can be challenging, as it requires understanding and changing the formula that governs habit formation. However, there are several strategies that can help. Firstly, identify your triggers and try to manage or avoid them. You can also replace nail biting with other activities, such as squeezing a stress ball, playing with a fidget toy, or chewing gum. Keeping your nails trimmed and well-maintained can also reduce the temptation to bite them. If you are struggling to break the habit on your own, cognitive behavioural therapy (CBT) and acceptance and commitment therapy (ACT) can help address the psychological aspects of nail biting.
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It may be a sign of a more serious psychological or emotional problem
Nail-biting is a common habit that often begins in childhood, and while some people outgrow it, it can become a lifelong practice. It is frequently associated with anxiety and can be a way to cope with stress, tension, boredom, or loneliness. The behaviour can also be a substitute for thumb or finger sucking.
For some people, nail-biting may be a sign of a more serious psychological or emotional problem. It is often classified as a body-focused repetitive behaviour (BFRB) and can be related to obsessive-compulsive disorders. People with BFRBs may also exhibit other behaviours such as skin picking and hair pulling. Additionally, there may be a genetic link, with some individuals inheriting a tendency towards developing BFRBs and higher-than-average rates of mood and anxiety disorders in their families.
Nail-biting can have negative consequences, including sore fingers, damaged nails and surrounding tissue, and an increased risk of infection. It can also lead to tooth damage. Chronic nail-biters may experience feelings of shame, embarrassment, or guilt related to the physical damage caused by the behaviour. They may also fear being judged or shamed by others for their appearance.
If nail-biting is causing significant distress or impacting daily life, it is important to seek professional help. Cognitive behavioural therapy (CBT) and acceptance and commitment therapy (ACT) can be effective in addressing the underlying psychological causes. Behavioural changes can be challenging and gradual, and it is important to be patient and persistent in the process of breaking the habit. Identifying triggers and replacing nail-biting with alternative behaviours, such as using a fidget device or stress ball, can be helpful strategies.
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It can cause physical damage to the skin, nails and teeth
Nail-biting can cause physical damage to the skin, nails, and teeth. Repeated nail-biting can make the skin around the nails feel sore and can damage the tissue that makes nails grow, resulting in abnormal-looking nails. Chronic nail-biters are also more vulnerable to infections as they pass harmful bacteria and viruses from their mouth to their fingers and from their nails to their face and mouth. This can lead to skin or nail infections.
Onychophagia, or chronic nail-biting, is considered a pathological oral habit and grooming disorder. It is characterized by compulsive nail-biting that is destructive to the fingernails and the surrounding tissue. Those who chronically bite their nails may experience distressing feelings of unease or tension prior to biting, as well as feelings of shame, embarrassment, anxiety, or guilt related to the appearance of physical damage to their skin and nails.
In addition to causing physical damage, nail-biting can also lead to tooth damage, such as chipped teeth, which may require corrective dental care. It is also associated with increased stress and anxiety, which can further reinforce the habit as a coping mechanism.
Breaking the habit of nail-biting can be challenging, but it is possible with persistence and the right plan. Identifying triggers and replacing nail-biting with alternative behaviours, such as squeezing a stress ball or chewing gum, can be effective strategies. Keeping nails trimmed and using bitter-tasting nail polish can also help reduce the temptation to bite. In more severe cases, cognitive behavioural therapy (CBT) and acceptance and commitment therapy (ACT) can address the underlying psychological aspects of nail-biting.
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It can be replaced with other behaviours or activities
Nail-biting is a common habit that often begins in childhood, and while some people outgrow it, it can become a lifelong habit. It is usually a coping mechanism to deal with nervousness, boredom, loneliness, or hunger. It can also be a symptom of underlying emotional or psychological problems, including obsessive-compulsive disorder, attention-deficit/hyperactivity disorder (ADHD), oppositional defiant disorder, and anxiety disorders.
Breaking the habit of nail-biting can be challenging, but it is possible with persistence and the right plan. One crucial step is to identify the triggers that lead to nail-biting. Once the triggers are understood, they can be managed, and the behaviour can be replaced with more positive activities.
One strategy is to keep your hands busy with alternative activities that do not involve putting your fingers in your mouth. Fidget devices, stress balls, silly putty, or fidget spinners can all help to keep your hands occupied. Chewing gum is another possible substitute, but it should be approached with caution as it can lead to dental or jaw problems if done excessively.
Another approach is to gradually reduce nail-biting by choosing one finger that you will not bite and sticking to it until the nail looks healthier. Then, you can move on to another finger and continue the process until you have broken the habit entirely.
Additionally, you can try to relieve stress and anxiety through activities such as exercising, practising breathing exercises or yoga, spending time outdoors, or talking to a loved one, friend, or counsellor. These activities can help address the underlying emotional triggers that may contribute to nail-biting.
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Frequently asked questions
Biting your fingernails can introduce germs and bacteria into your mouth, which can lead to a range of illnesses, including colds, stomach problems, and salmonella. It also damages the skin around your nails, creating tiny fissures that can become infected. In addition, nail biting can cause dental issues such as misalignment and chipped teeth, and in severe cases, it may lead to hangnails, ingrown nails, or nail infections.
Here are a few strategies to help you stop biting your fingernails:
- Identify your triggers: Understand what situations or emotions, such as boredom, stress, or anxiety, trigger your nail-biting habit.
- Find alternative behaviours: Try occupying your hands and mouth with other tasks, such as squeezing a stress ball, playing with a fidget toy, or chewing gum.
- Keep nails trimmed: Maintaining short nails reduces the temptation to bite them.
- Use bitter-tasting nail polish: Coat your nails with a special nail polish that tastes unpleasant to deter nail biting.
- Wear gloves or nail covers: Using gloves or stickers designed to cover nails can physically prevent you from biting them.
- Form healthy habits: Engage in hobbies that keep your hands busy, such as crocheting, drawing, or needlework.
Nail biting is a common habit, with approximately 30% of children and 15% of adults engaging in this behaviour. While it is often a nervous habit triggered by stress, excitement, or boredom, it can sometimes be a sign of a more serious psychological, emotional, or mental stress issue. If you repeatedly try to quit nail biting without success, it is recommended to consult a doctor or a mental health professional for further evaluation and support.
There are several products and treatments available to help you break the habit of nail biting:
- Bitter-tasting nail polishes: These nail polishes are designed to have an unpleasant taste to discourage nail biting.
- Mouthguards: Using a mouthguard can physically prevent you from biting your nails.
- Stress balls and fidget toys: These provide a tactile alternative to keep your hands busy and reduce the urge to bite your nails.
- Behavioural therapy: If you find it difficult to stop nail biting, behavioural therapy can be an effective option to address the underlying habits and triggers.










































