Mouth Ulcers: Causes, Prevention and Treatments

Short summary

Mouth ulcers are a common, usually harmless condition that tends to heal within one to two weeks. The article explains why ulcers appear, including trauma to the mouth, spicy or acidic foods, stress, hormonal changes, and nutritional deficiencies, as well as how medications and genetics can contribute. It also covers practical ways to ease pain and speed healing, from warm saltwater rinses to over the counter topical treatments and steroid options for tougher cases. The piece highlights the potential role of toothpaste ingredients, such as sodium lauryl sulphate, in triggering ulcers and suggests SLS-free alternatives. Prevention tips include using a soft toothbrush, regular dental checkups, a balanced diet, stress management, and tracking foods that may trigger ulcers. If ulcers persist beyond three weeks, seek medical advice. Source: NHS

• Common ulcers heal in about a week or two
• Trauma, spicy foods, stress, and nutrient deficiencies are key triggers
• Rinses, topical anesthetics, antiseptic mouthwashes, and steroids can help
• Switch to SLS-free toothpaste if toothpaste is a trigger

Overview of mouth ulcers

Mouth ulcers are small, painful patches that can appear inside the mouth and disrupt eating, drinking and speaking. The article notes that these ulcers are extremely common and most heal on their own within a week or two. While they are usually harmless and not contagious, they can still have a significant impact on daily life. The prevalence is higher among teenagers and young adults, and some people experience a few ulcers each year while others see ulcers recur regularly. The piece also mentions recurrent aphthous stomatitis as a pattern of repeated ulcers and explains that an overactive immune response in the mouth may contribute to ulcer formation.

Causes and risk factors

Understanding why ulcers occur often involves straightforward triggers. Trauma to the mouth—such as accidentally biting the cheek, brushing too aggressively, or irritation from braces or dentures—can trigger an ulcer. Foods that are spicy, salty or acidic can irritate the mouth lining. Stress, fatigue and hormonal changes can also play a role, with some people noting ulcers flare around their menstrual period or during periods of workplace or home pressure. In some cases, ulcers are linked to deficiencies in iron, zinc, folate, B vitamins or vitamin D, or to underlying conditions like coeliac disease or Crohn’s disease or a weakened immune system. Medications, including some anti-inflammatory drugs, beta blockers, and certain lung medicines, can also trigger ulcers. A genetic component is possible, as ulcers can run in families. The article also mentions that stopping smoking may trigger ulcers in the first weeks after quit‑status.

How to get relief and speed healing

Although there is no instant cure, several strategies can ease pain and promote healing. A warm saltwater rinse can soothe discomfort and reduce inflammation. Over‑the‑counter topical treatments, including local anaesthetics such as lidocaine and benzocaine, numb the area briefly to improve eating and drinking. Antiseptic and anti‑inflammatory mouthwashes, including chlorhexidine and benzydamine, can help reduce pain and may shorten healing time slightly. For more stubborn ulcers, steroid tablets that dissolve in the mouth are available, and doctors or dentists can prescribe steroid sprays or stronger mouthwashes to reduce pain, swelling and speed healing. The article also notes that sodium lauryl sulphate, a foaming agent in many toothpastes, has been linked to ulcers in some people, so switching to an SLS‑free toothpaste may help some individuals.

Dietary and daily-life considerations

Soft, non‑irritating foods and cool drinks can be easier to tolerate while an ulcer heals. Avoid spicy, acidic, or rough foods such as crisps. Hydration and gentle consumption patterns can help reduce pain and discomfort.

Prevention

Prevention is often easier than treatment. Using a soft‑bristled toothbrush, maintaining regular dental checkups, and eating a balanced diet can help protect the mouth lining. Managing stress and getting enough sleep may reduce ulcer frequency. If you suspect certain foods trigger ulcers—common culprits include chocolate, coffee, nuts and tomatoes—keeping a diary can help identify patterns. The article also notes that some people may benefit from toothpaste without SLS to reduce irritation.

Red flags and when to seek care

If a mouth ulcer lasts longer than three weeks, keeps returning, or looks unusual, it should be checked by a clinician. In some rare cases, a persistent ulcer can be associated with mouth cancer or other underlying conditions, so ongoing monitoring is important.

Bottom line

Tomatoes can be a trigger for some people, and simple changes—from toothpaste choices to stress management—can make ulcers less frequent. When ulcers appear, a combination of saltwater rinses, topical analgesics, antiseptic mouthwashes, and, if needed, steroid therapy can help manage pain and speed healing.

Key insights

• Ulcers are common, usually self-healing and not contagious
• Triggers include mouth trauma, spicy or acidic foods, stress and nutritional deficiencies
• Relief strategies include saltwater rinses, topical anaesthetics, antiseptic mouthwashes, and steroid options
• Consider SLS-free toothpaste if toothpastes irritate the mouth