Chewing gum is not unhealthy for most people, and sugar-free varieties may actually benefit your teeth. The concerns that do exist are minor and tied to specific ingredients or excessive habits rather than gum chewing itself. Here’s what the evidence says about the real risks and benefits.
Sugar-Free Gum Helps Your Teeth
The most well-supported health effect of chewing gum is a positive one: sugar-free gum reduces cavities. A systematic review in the Journal of Applied Oral Science found that seven out of eight clinical trials demonstrated significant cavity reduction from chewing sugar-free gum compared to not chewing gum at all. The protective effect comes from the chewing process itself. When you chew, your mouth produces more saliva, which washes away food particles and neutralizes the acids that eat into enamel.
Interestingly, the cavity-fighting benefit doesn’t appear to come from special sweeteners like xylitol or sorbitol. One trial found that a sugar-free control gum without any of these sweeteners still reduced cavities compared to no gum use. The combination of increased saliva, the absence of sugar, and the fact that oral bacteria can’t convert sugar alcohols into acid all work together.
That said, xylitol does have a specific antibacterial benefit at higher doses. Research shows that consuming 5 to 6 grams of xylitol per day, spread across at least three chewing sessions, significantly reduces levels of the bacteria most responsible for tooth decay. Below about 3.4 grams per day, no measurable effect was seen. A typical piece of xylitol gum contains about 1 gram, so you’d need several pieces daily to reach effective levels. Going above 10 grams doesn’t add any extra benefit.
Sugared gum, on the other hand, feeds the bacteria in your mouth and promotes cavities. If you’re going to chew gum, sugar-free is the clear winner.
Digestive Side Effects From Sugar Alcohols
The sugar alcohols that make sugar-free gum safe for your teeth can cause digestive trouble if you chew a lot of it. Sorbitol, one of the most common sweeteners in gum, can cause diarrhea, bloating, and gas when consumed in large amounts. The threshold is roughly 50 grams of sorbitol per day. Mannitol, another sugar alcohol, causes similar effects at a lower dose of about 20 grams per day.
A single piece of gum contains only 1 to 2 grams of sugar alcohol, so you’d need to chew an extraordinary amount to hit those levels from gum alone. But if you’re also eating sugar-free candy, protein bars, or other products sweetened with sugar alcohols, the totals can add up. If you notice bloating or loose stools and you chew gum regularly, cutting back is worth trying.
The Jaw Pain Question
One of the most common concerns about gum is whether it causes jaw problems. A study published in the Journal of Clinical Medicine looked specifically at whether chewing frequency, session duration, or the long-term nature of the habit predicted temporomandibular disorders (the clinical term for jaw joint pain and dysfunction). None of these factors showed a statistically significant link. The effect sizes were small across the board.
That doesn’t mean gum can never aggravate an existing jaw issue. If you already have jaw pain or clicking, hours of daily chewing could make it worse. But for people with healthy jaws, regular gum chewing doesn’t appear to be a meaningful risk factor.
What About Aspartame and BHT?
Two additives in gum get the most attention: aspartame (an artificial sweetener) and BHT (a preservative used in gum base).
In 2023, the World Health Organization’s cancer research agency classified aspartame as “possibly carcinogenic to humans,” which sounds alarming but is actually the organization’s third-highest tier, based on limited evidence. A separate WHO committee reviewed the same data and found no reason to change the safe daily intake level of 40 milligrams per kilogram of body weight. For a 150-pound person, that’s about 2,700 milligrams per day. A stick of gum contains roughly 6 to 8 milligrams of aspartame. You would need to chew hundreds of pieces daily to approach the limit.
BHT is a preservative added to gum base to prevent it from going rancid. Animal studies have linked high doses to liver enlargement and increased cancer rates, which is why the FDA caps BHT in gum base at 1,000 micrograms per gram. The World Health Organization sets an acceptable daily intake of 300 micrograms per kilogram of body weight. At the concentrations allowed in commercial gum, typical consumption falls well within safety limits. The FDA considers it generally recognized as safe at current levels, though it has noted that some uncertainties remain.
Stress Relief and Focus
Chewing gum appears to lower stress hormones. A study measuring cortisol levels during a stressful lab task found that participants who chewed gum had reduced cortisol and reported less negative mood compared to non-chewers. The exact mechanism isn’t fully understood, but increased blood flow to the brain during chewing is one proposed explanation. Many people find that gum helps with alertness or concentration during repetitive tasks, and the cortisol data gives that experience some biological backing.
Post-Surgery Recovery
One of the more surprising uses of chewing gum is in hospitals. After abdominal surgery, the digestive system often temporarily shuts down, a condition called postoperative ileus. A Cochrane review found that chewing gum after surgery reduced the time to first bowel movement by about 12.7 hours and shortened hospital stays by roughly 0.7 days on average. The “sham feeding” of chewing tricks the digestive system into reactivating, stimulating the release of digestive hormones and saliva. It was well tolerated by patients and didn’t increase complications.
Swallowed Gum Passes Through
Your body can’t break down gum base, but swallowing a piece isn’t dangerous. It moves through your digestive tract largely intact and comes out in your stool. The Mayo Clinic notes that on rare occasions, large amounts of swallowed gum combined with constipation have caused intestinal blockages in children. For adults who occasionally swallow a piece, there’s no meaningful risk.
How Much Is Too Much
For most people, a few pieces of sugar-free gum per day is perfectly fine and likely good for your teeth. The practical upper limit is set by your gut: if you start experiencing gas or diarrhea, you’re consuming too many sugar alcohols. Sticking to five or six pieces per day keeps you in the range that benefits dental health without pushing toward digestive discomfort. If you have an existing jaw condition, shorter chewing sessions are a reasonable precaution, even though the research doesn’t show gum causes jaw disorders on its own.