Chewing Gum: Ingredients, Benefits and Safety

Chewing gum looks simple, but its effects depend on whether it contains sugar, which sweetener is used and how often you chew it. Sugar-free gum can be useful after a meal when brushing is not possible, because chewing increases saliva. That does not make gum a dental treatment, an appetite-control tool or a harmless habit for everyone. The useful question is what is in it, why you are using it and how your mouth, jaw and digestion respond.

Read the label beyond the flavour name. Check whether sugar appears near the start of the ingredient list, which sugar alcohols (polyols) are present, and whether caffeine, nicotine, herbal extracts or vitamins have been added. Medicated gums, such as nicotine gum, follow their own dosing rules and should be used exactly as directed.

What is actually in gum?

Most chewing gum contains a gum base that gives it elasticity, plus softeners, flavourings and either sugar or a non-sugar sweetener. The base is not digested, although accidentally swallowing one piece is generally not dangerous because it moves through the digestive tract. The bigger everyday difference is the sweetener. Sugar-sweetened gum repeatedly exposes teeth to fermentable sugar, whereas sugar-free gum does not feed cavity-causing bacteria in the same way.

Sugar-free does not mean ingredient-free. Sorbitol, mannitol, maltitol and xylitol are polyols commonly used for sweetness (see our guide to sugar substitutes). They supply fewer digestible carbohydrates than sugar and have little direct cavity-promoting effect. However, they are not fully absorbed, so larger amounts can draw water into the bowel and be fermented by gut bacteria, causing bloating, cramps or diarrhoea, especially when several pieces are chewed through the day.

Can gum protect your teeth?

Chewing increases saliva flow. Saliva washes away food particles, dilutes acids and helps the mouth return to a safer pH after eating. That is why the American Dental Association says chewing sugar-free gum for about 20 minutes after meals can help prevent tooth decay, and some products carry its Seal of Acceptance.

Xylitol is often singled out, but a Cochrane review found the evidence that xylitol products prevent cavities is of low quality, and the ideal dose is not established. A xylitol gum is reasonable if you tolerate it, but chewing more is not better. Twice-daily brushing with fluoride toothpaste, cleaning between teeth, fewer sugary snacks and regular dental check-ups remain the foundations of cavity prevention.

Will it curb your hunger?

Chewing can occupy the mouth and may reduce the urge to snack in a particular moment, but it does not reliably switch off biological hunger. If lunch was too small or many hours have passed since a meal, gum only postpones the signal, and repeatedly using it to avoid food can leave you irritable or overly hungry later. Regular meals built around vegetables, dal and other pulses, whole grains, curd or paneer, nuts and seeds are more dependable for weight management.

Any extra energy used by chewing is too small to affect body weight. Gum can still serve a narrow purpose, such as marking the end of a meal or freshening your breath before a meeting.

Why can your gut object?

Bloating after gum is not always about the gum itself. Chewing with the mouth open, talking while chewing or replacing one piece with another can increase swallowed air. Sugar alcohols are a second trigger. Try fewer pieces, chew more slowly and compare products with different sweeteners, changing one thing at a time.

People with irritable bowel syndrome (IBS) are often sensitive to polyols such as sorbitol and mannitol; the NHS advises people with IBS to avoid sorbitol. Strong mint flavours or swallowed air may also worsen reflux for some people. Symptoms that persist after stopping gum need a medical review, since abdominal pain, changed bowel habits or reflux can have other causes. Persistent dry mouth also deserves assessment, because medicines, dehydration and some health conditions can cause it.

When should you stop chewing?

Long chewing sessions can tire the jaw muscles and aggravate clicking or pain, especially if you have a temporomandibular joint (TMJ) disorder. If your jaw feels tight, you get headaches or the jaw locks, take a break and seek dental advice if symptoms continue. Gum can also be uncomfortable with braces, loose fillings, dentures or after dental procedures, so follow your dentist's guidance.

Children should be old enough to understand that gum is chewed, not swallowed, and should not run or play with gum in the mouth because of the choking risk. Keep xylitol gum away from dogs: xylitol can cause a dangerous fall in a dog's blood sugar. For most adults, an occasional piece of sugar-free gum is uncomplicated.

The bottom line

Chewing gum is a useful convenience when it is sugar-free, used briefly and well tolerated. Let saliva support your routine, but let brushing, fluoride toothpaste and dental care do the serious work.

Editorial sources

• •Chewing Gum – MouthHealthy, American Dental Association
• •Xylitol-containing products for preventing dental caries in children and adults – Cochrane Database Syst Rev, 2015 (PubMed)
• •Diet, lifestyle and medicines for IBS – NHS
• •TMD (temporomandibular disorders) – National Institute of Dental and Craniofacial Research
• •How to keep your teeth clean – NHS