You can change your mouth in several meaningful ways, from reshaping your teeth and lips to improving how your mouth functions day to day. The approach depends on what you’re after: a structural change like straighter teeth or a more defined jaw, a cosmetic change like fuller lips, or a functional shift like healthier gums, better breathing, or even how food tastes. Here’s what actually works and what to expect from each option.
Straightening Your Teeth
Orthodontic treatment is the most common way adults reshape their mouth. Traditional metal braces remain the most effective option for complex cases and typically take 18 to 36 months. Clear aligners like Invisalign work well for mild to moderate misalignment and generally finish faster, in 12 to 24 months. Ceramic braces use tooth-colored brackets and take about the same time as metal (18 to 36 months), while lingual braces sit behind your teeth so they’re invisible but require 24 to 36 months.
Standard braces reposition teeth using brackets and wires that apply continuous pressure, while clear aligners move teeth in small steps through a series of custom trays you swap out every week or two. Adults can expect slower movement than teenagers because bone density increases with age, which means treatment often lands at the longer end of those ranges. A retainer after treatment is non-negotiable if you want the results to last.
Changing Your Jaw Structure
If your concern is a recessed chin, an uneven bite, or a jaw that doesn’t close properly, orthodontics alone may not be enough. Orthognathic surgery physically repositions the jawbones to correct skeletal misalignment. The most common procedure for a recessed lower jaw is bilateral sagittal split osteotomy, which advances the mandible forward. Some patients need surgery on both jaws, and a small number also get a genioplasty (chin repositioning) for additional definition.
The lower third of the face, particularly the chin and lower lip, shows the most visible change after surgery compared to braces-only treatment. Candidates typically have a significant overbite (6 to 12 mm of overjet), a convex facial profile, and completed skeletal growth. Recovery involves a period of restricted diet and swelling, but the structural correction is permanent.
Myofunctional Therapy and Tongue Posture
Where your tongue rests and how you swallow can subtly influence the shape of your mouth over time. In a healthy resting position, the tongue sits high on the palate just behind the upper front teeth, with the lips gently closed. Myofunctional therapy uses targeted exercises to retrain these patterns. It’s a form of neuromuscular re-education that improves the resting posture of the tongue, lips, and cheeks while correcting dysfunctional swallowing.
Common exercises include holding a thin object like a popsicle stick between the lips for five seconds at a time (repeated 5 to 10 times) to build lip seal strength, and lip puffing, where you force air between your lips and teeth to build muscle tone. These exercises improve the coordination and strength of facial muscles. Myofunctional therapy also reduces the chance of relapse after orthodontic treatment, making it a useful complement to braces or aligners rather than a standalone fix.
Switching From Mouth to Nasal Breathing
Chronic mouth breathing quietly reshapes your mouth in ways most people don’t realize. Over time, it leads to a narrower face, a higher palate, crowded and crooked teeth, malocclusion, and a receded lower jaw. It also contributes to gum disease, bad breath, enlarged tonsils, and a higher incidence of snoring and sleep apnea.
Nasal breathing does the opposite. It helps form natural dental arches and promotes straighter teeth. Your nose also produces nitric oxide, a molecule that widens blood vessels, opens airways, and has antibacterial and antiviral properties. Nitric oxide output across the nasal passages is roughly three times greater during inhalation than exhalation, meaning every breath through your nose delivers a significant dose that mouth breathing skips entirely.
If you catch yourself breathing through your mouth during the day, consciously close your lips and breathe through your nose. At night, some people use mouth tape (a small strip of surgical tape over the lips) to encourage nasal breathing during sleep. If nasal congestion makes this difficult, addressing allergies or a deviated septum may need to come first.
Changing Your Lips
Two minimally invasive procedures dominate lip enhancement, and they work very differently. Dermal fillers use hyaluronic acid injected directly into the lips to add volume and reshape them. Results last up to 12 months. The procedure carries risks of bruising, swelling, and in rare cases filler migration.
A “lip flip” takes a different approach. Instead of adding volume, it uses a neurotoxin injected above the upper lip to relax the muscle that pulls the lip inward. This causes the upper lip to roll slightly outward, creating a subtle pout without increasing actual lip size. The effect lasts only 8 to 12 weeks and requires no aftercare, so you can return to normal activities immediately. The tradeoff: because it relaxes a muscle you use constantly, some people experience temporary difficulty pronouncing certain words, drinking through a straw, or whistling.
The two can be combined. A lip flip adds subtle definition to the upper lip border and reduces the appearance of vertical lip lines, while filler provides the volume. If you want a natural, low-commitment starting point, the lip flip is the less invasive option to try first.
Improving Your Oral Microbiome
Your mouth contains hundreds of bacterial species, and the balance between them determines whether you get cavities, gum disease, or neither. The single biggest factor that tips this balance toward harmful bacteria is sugar. Frequent consumption of sugar-rich foods and drinks feeds the bacteria that produce acid, which erodes enamel and promotes plaque. It’s worth noting that dental cavities were rare in ancient populations that lacked fermentable carbohydrates in their diet.
Reducing sugar intake is the most effective dietary change you can make for your mouth. Beyond that, several interventions help shift the bacterial balance in a healthier direction: xylitol (a sugar substitute that harmful bacteria can’t metabolize), dental probiotics that introduce beneficial strains, oil pulling, and antiseptic rinses containing essential oils. Consistent brushing and flossing remain foundational because they physically remove the biofilm where pathogenic bacteria thrive. Poor oral hygiene, certain medications (especially those that reduce saliva), and smoking all disrupt the microbiome in ways that compound over time.
Changing How Things Taste
Your taste buds regenerate roughly every 10 to 14 days, which means your sense of taste is more malleable than you might think. Zinc plays a central role in this process. It’s a key component of gustin, the primary zinc-containing protein in saliva that supports taste bud growth and development. People with low salivary zinc concentrations show measurably reduced taste sensitivity, and supplementing zinc in those individuals has been shown to restore both salivary zinc content and gustin levels, improving taste perception.
Vitamin B12 deficiency can also dull taste by affecting the tongue’s surface. If food has started tasting bland or “off,” a nutritional deficiency is worth investigating before assuming it’s just aging. Other common culprits include antihistamines, antibiotics, and radiation therapy to the head and neck.
On the habit side, people who gradually reduce their salt or sugar intake often report that their sensitivity to both recalibrates within a few weeks. Foods that once tasted normal start tasting overly salty or sweet. This isn’t imaginary; it reflects the taste bud turnover cycle adapting to a new baseline.