Mouth Breathing and Gum Disease: Why Your Front Gums Stay Red and Swollen

Short answer: Red, swollen gums at the front that bleed despite good brushing? Mouth breathing dries the gums and is linked to gingivitis.

Medically reviewed by Dr. Prashanth R. Reddy, ENT Surgeon (MS ENT) · Last reviewed: 31 October 2026

How mouth breathing affects the gums

Healthy gums are kept moist by saliva and protected by closed lips. When the lips stay apart and air flows over the front gums, they dry out and become inflamed. In schoolchildren aged 11 to 14, gum inflammation was greater in mouth breathers and in those whose lips didn't close at rest, especially on the upper front gums (Wagaiyu and Ashley, 1991).

A dry mouth also lets plaque bacteria grow faster, so the gums stay swollen and bleed easily despite good brushing.

Why do people breathe through the mouth?

Usually because the nose doesn't let enough air through. Common reasons are a deviated septum, swollen turbinates, nasal allergy, chronic sinusitis, nasal polyps and, in children, enlarged adenoids and tonsils. Sometimes it starts as a habit and stays even after the nose clears.

Signs you or your child may be a mouth breather

• Lips apart at rest or during sleep
• Snoring, dry mouth or drooling on the pillow
• Waking tired, dark circles under the eyes
• Bad breath and frequent throat clearing
• Always 'blocked' nose, especially at night

What helps

1. Find out why the nose is blocked. An ENT evaluation (examination plus a CT scan of the nose where needed) shows whether it's the septum, turbinates, allergy, sinuses or adenoids.
2. Treat the cause, from allergy control and nasal sprays to correcting a blockage when it's needed.
3. Work with your dentist or orthodontist on the teeth, gums and bite.
4. Re-train nasal breathing once the nose is open, with lips closed at rest.

When to see an ENT

If you or your child breathe through the mouth most of the time, snore, or have a constantly blocked nose, an ENT evaluation can find the cause.

References

• Wagaiyu EG, Ashley FP. Mouthbreathing, lip seal and upper lip coverage and their relationship with gingival inflammation in 11-14 year-old schoolchildren. Journal of Clinical Periodontology. 1991;18(9):698-702.
• Choi JE, et al. Intraoral pH and temperature during sleep with and without mouth breathing. Journal of Oral Rehabilitation. 2016;43(5):356-363.

Related reading: Mouth breathing and bad breath · Mouth breathing and tooth decay · Mouth breathing and crooked teeth · Mouth breathing and a high-arched palate · Mouth breathing, a receding jaw and a long face

About the author

Dr. Prashanth R. Reddy is a Senior Consultant ENT Surgeon in Bengaluru (MS ENT; Fellowship in Rhinoplasty, Seoul; MBA, IIM Bangalore) with over two decades of practice. He sees patients at Sakra World Hospital, Marathahalli and at the ENTHealth360 clinic in Koramangala.

For educational purposes only. Not a substitute for medical advice. Please consult a qualified ENT specialist.