Dental Crowding — "Doggy Breath" Isn't Normal

Most Frenchie owners are told that "doggy breath" is normal. It isn't. That smell is anaerobic bacteria, actively eating gum tissue. And in a Frenchie's crowded little mouth, food and plaque get trapped easily.

I. What Dental Crowding Is

Dogs have 42 adult teeth. The Frenchie brachycephalic jaw is shortened, but tooth count isn't. Teeth are pushed sideways, rotated, and stacked. Food packs into gaps. Plaque starts hardening into tartar within 24 hours. Tartar sits below the gumline, producing chronic gum inflammation — periodontal disease, with bone loss, gum recession, and eventual tooth loss.

II. The Underdiagnosis Paradox

VetCompass 2021 found lower diagnosed periodontal disease in Frenchies (1.6%) vs non-Frenchies (12.8%) — adjusted OR 0.31. Our opinion: this is most likely underdiagnosis, not protection. Frenchies present for breathing, skin, ear, and orthopedic issues — mouths often go unexamined unless they reek.

Veterinary dentistry literature consistently flags brachycephalic dogs as HIGH-RISK for periodontal disease and dental crowding.

III. Why Frenchies Are Prone

• Crowding & rotation — upper P3 and lower P1 most commonly rotated. Rotated teeth = abnormal periodontal pockets that trap food.
• Mandibular first premolar cyst risk — missing or unerupted P1 in brachycephalic dogs predisposes to dentigerous cyst formation. AVDC (American Veterinary Dental College): any missing P1 in a Frenchie should be radiographed.
• Reduced mandibular bone density with age — extractions needed earlier.
• Mouth breathing (BOAS dogs) — chronic open-mouth breathing dries oral mucosa and accelerates plaque.

IV. Symptoms Owners Miss

• Bad breath — actively foul, sulfuric (NOT just "doggy breath").
• Brown or yellow buildup at the gumline.
• Red or swollen gums.
• Gum recession (teeth look "longer").
• Bleeding when chewing.
• Dropping food.
• Chewing on one side.
• Loose teeth.
• Facial swelling under the eye can be a sign of an infected tooth root.

If you notice any of these signs, call your vet today. If his mouth bleeds or he refuses food for more than 12 hours, take him to the vet today.

V. Why It Matters Beyond the Mouth

Veterinary literature shows dogs with severe (stage 3) periodontal disease have a significantly elevated risk of endocarditis (heart valve infection). Exact figures vary by study.

Oral bacteria entering the bloodstream during chewing reach kidney and liver capillaries → microabscesses. Documented links: azotemic chronic kidney disease, cardiac disease, hepatic disease, thromboembolic events.

In small or brachycephalic breeds with thinning mandibles: severe periodontal bone loss can cause spontaneous mandibular fracture from normal chewing.

Spike's reality  ·  Dominican Republic

"Brushing matters a lot in this breed — if he lets you. With Spike, brushing is hard, so he gets dental toys, and we look at his gums and teeth regularly. If you brush, use dog paste only — never human paste, the xylitol is fatal. The mouth is small, the teeth are crowded, and bacteria don't take days off."

VI. Daily Home Care

Brushing

• YES, Frenchies can be brushed.
• Brushing every day is the gold standard, because plaque starts hardening into tartar within 24 hours.
• Brush his teeth 3–4 times a week if he lets you — that is the realistic minimum that moves the needle.
• Never force brushing on a dog that bites.
• Look at his gums once a month.
• Soft pet toothbrush or finger brush.
• Dog toothpaste only — xylitol in human toothpaste can cause liver failure and dangerously low blood sugar.
• Focus on outer surfaces along the gumline.

VOHC-Accepted Products

The seal of the VOHC (Veterinary Oral Health Council) is the only one backed by clinical data showing at least 20% less plaque or tartar.

• Give him a dental chew with the VOHC seal every day.
• Look for the VOHC seal on chews and additives.
• AVOID products that claim to be "vet recommended" but have no VOHC seal — the VOHC seal comes from an independent review.

Water Additives

VOHC accepts a few, such as HealthyMouth — they help but don't replace brushing. Ask your vet before you add anything to his water.

VII. Professional Cleaning Under Anesthesia

• Small breeds and brachycephalics often need a professional cleaning under anesthesia (COHAT) every 6–12 months.
• AAHA (American Animal Hospital Association): first cleaning by age 1 for small breeds.
• Cost: $350–500 for a routine cleaning at a general vet clinic, $800–1,500+ if extractions, $1,500+ for specialist dentistry.

VIII. Tooth Extraction in Frenchies

Most commonly extracted: rotated upper P3, lower P1, severely crowded incisors, fractured upper P4 (slab fractures from chewing hard items).

After the extractions, Frenchies often eat better — they had been chewing around painful teeth.

IX. Common Owner Mistakes

1. "Doggy breath" is active disease — NEVER ignore it — that's anaerobic bacteria at work. It is NEVER normal.
2. Grain-free dental chew myth — grain content has no clinical relevance to dental efficacy. Look for VOHC.
3. Never give him bones, antlers, or hard nylon toys — they are a leading cause of broken teeth (slab fractures). AVDC rule: if you can't dent it with a fingernail, it's too hard.
4. ALWAYS get the annual oral exam — most dental disease occurs below the gumline, where you can't see it.
5. Do NOT avoid anesthesia — modern anesthesia is far safer than untreated periodontal sepsis.

About the Author

Spike’s Dad

Not a veterinarian — the human behind Spike, a dark brindle Frenchie, for 7+ years. What is written here is checked as carefully as we can against the sources listed above. When real life with Spike differs from the studies, we say so.

How this site is researched →