Parents tend to think of dental protection in simple terms: a mouthguard for sports, a clear aligner for straighter teeth.
But the devices meant to shield or shape a smile can also create problems when fit, hygiene or use fall out of sync with reality.
And according to Phoenix dentist Dr. Amelia M. Ellingson, families often overlook what’s happening under the plastic.
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Fall sports across Arizona bring the usual mix of competition, collisions and dental injuries. Mouthguards return to football fields, volleyball courts and gym mats — but not all guards protect the same way.
Beginning with the 2026 season, new National Federation of State High School Associations rules prohibit tooth and mouth protectors from having attachments that do not serve a protective purpose or pose a safety risk. The change is prompting families to take a closer look at what their athletes are wearing.
“Parents often think of mouthguards as football equipment, but teeth can be injured in a lot of different sports,” Ellingson said. “The question is not only whether your child has a mouthguard. It is whether it fits well enough that they will actually wear it.”
The American Dental Association cites research showing that athletes who skip mouthguards face more than twice the risk of orofacial injury compared with athletes who use them. But the type of guard matters. Stock guards are inexpensive but can shift during play.
Boil‑and‑bite guards offer a more personalized fit, though poor molding can leave the material uneven or too thin. Custom guards, made from impressions or scans, offer the most precise fit — and, Ellingson noted, the best chance that an athlete will keep it in place.
“A mouthguard should stay in place without an athlete constantly biting down on it,” she said. “They should be able to breathe, communicate and focus on the game instead of adjusting it every few seconds.”
The right level of protection also depends on the sport. A younger volleyball player may not need the same guard as an older athlete in hockey or football.
Some custom systems, including PlaySafe, are designed with different protection levels for different types of athletes. And because children grow, lose teeth and start orthodontic treatment, fit should be reevaluated regularly. A guard that worked last season may not work now.
But sports aren’t the only place where plastic meets enamel — and not the only place where families underestimate the environment inside the mouth.
Clear aligners, worn 20 to 22 hours a day, have become a popular alternative to braces. They are discreet, removable and make brushing and flossing easier. Yet removable does not mean maintenance‑free. A July systematic review of 34 studies found that clear‑aligner treatment can be associated with enamel demineralization, white‑spot lesions, cavities in areas with poor hygiene and periodontal changes. Many effects were mild or temporary, but the findings underscore how much can happen beneath the trays.
“Clear aligners can be a great option, but the tray changes the environment around the teeth,” Ellingson said. “If plaque, acid or sugar is trapped underneath for hours, you are giving it prolonged contact with enamel and gum tissue.”
Saliva normally helps wash away debris and neutralize acids. When aligners cover most tooth surfaces, saliva doesn’t reach every area as easily. That makes pre‑tray hygiene essential — and it makes certain habits risky. Sipping coffee with sweetener, energy drinks or soda while wearing aligners can allow sugar and acid to seep under the plastic and stay there.
“You do not want to turn the aligner into a little holding tray for sugar and acid,” Ellingson said. “Take it out, have the drink, rinse or clean your mouth as appropriate and then put the aligner back in.”
White‑spot lesions — chalky, opaque patches — can be an early sign of enamel demineralization. They may improve with appropriate care, but they can also progress toward decay. Aligners themselves can accumulate microbial buildup, meaning clean teeth need clean trays.
Gum health matters, too. Patients with recession, thin tissue, or bone loss may need closer monitoring. New bleeding, inflammation, persistent, bad breath, or “black triangles” between teeth should be evaluated.
Whether the device is a guard or an aligner, Ellingson’s message is the same: protection and movement should never happen in isolation.
“You want protection to become part of the routine, just like shoes, a helmet or shin guards,” she said. “And with aligners, straightening teeth and protecting teeth have to happen at the same time.”
