June 24, 2026 | Puppy Essentials • Best Dog Toys • Crate Training • Dental Disease
Puppies are born toothless. By 8 months, they have 42 permanent teeth that must last 12-15 years. The six months between are a biological demolition derby: 28 baby teeth erupt, fall out, and are replaced by 42 adult teeth, all while the puppy uses its mouth as its primary exploration tool. Understanding the teething timeline lets you match chew toys to the current phase—a teething ring that worked at 12 weeks is useless at 5 months when the puppy's jaw pressure has tripled. Here is the timeline, the toy progression, and Dr. Ian Dunbar's bite inhibition protocol that separates the puppies who mouth gently from the dogs who break skin.
| Age | Teething Stage | What's Happening | Correct Chew Toy Type | Avoid |
|---|---|---|---|---|
| Birth–2 weeks | Edentulous (no teeth) | Gums only. Nursing. | None needed | — |
| 3–6 weeks | Deciduous incisors + canines erupt | 28 baby teeth emerge: 12 incisors (front nipping teeth), 4 canines (fangs), 12 premolars. First solid food. Weaning begins. | Soft rubber teething keys (Nylabone Puppy Teething Keys, $5)—softer than adult chews. The puppy's jaw is weak; hard nylon hurts. | Hard nylon bones, antlers, cow hooves—baby teeth are fragile and can fracture. Puppy femur fractures on hooves are documented in veterinary dental case reports. |
| 8–12 weeks | Full deciduous dentition | All 28 baby teeth fully erupted. Puppy leaves littermates, enters new home. Mouth exploration peaks—everything goes in the mouth. | Frozen wet washcloth (cold numbs gums—same principle as human teething babies), Kong Puppy ($7)—blue rubber, softer than red classic Kong. Stuff with wet food and freeze—the cold + licking + chewing trifecta keeps a puppy occupied for 30 minutes. | Rope toys (ingested strands cause linear foreign body obstruction—surgical emergency). Squeakers removed from plush toys (swallowed = obstruction). |
| 12–16 weeks | Deciduous incisors shed; permanent incisors erupt | Tiny front teeth fall out, often swallowed (harmless). Adult incisors push through. Gums are inflamed and sensitive—puppy chews more intensely to relieve pressure. | Benebone Puppy Chew ($8)—nylon with real bacon flavor infused throughout. Softer than adult Benebone. The wishbone shape lets puppy hold between paws and chew—correct oral posture. | Ice cubes—too hard for puppy enamel. Cold water in a Kong is sufficient. |
| 4–6 months | Canines + premolars shed; permanent canines + premolars erupt | The fangs fall out (often found on the floor—saved by sentimental owners in a baby book). Adult canines are massive compared to baby canines—3× the diameter. Jaw pressure increases roughly 50% from week 12 to week 20. | Himalayan Yak Chew ($8)—hardened yak/cow milk cheese. The puppy gnaws off microscopic layers, digesting them safely. Lasts 2-3× longer than bully sticks per chewing hour. Microwave the nub at the end to puff into a crunchy cheese snack. | Bully sticks unsupervised (choking hazard when worn to a 1-inch nub—always remove and discard the nub). Rawhide—chemically processed, non-digestible, expands in stomach causing obstruction. |
| 6–8 months | Molars erupt; full adult dentition (42 teeth) | The final 10 molars (4 upper, 6 lower) erupt—these are the crushing teeth, 4× the surface area of premolars. Jaw pressure reaches near-adult levels. Teething pain subsides. | Benebone Wishbone Adult ($12)—harder nylon for adult jaw pressure. West Paw Zogoflex Hurley ($14)—solid dog bone made of floatable, dishwasher-safe Zogoflex material that flexes slightly under maximum bite force, reducing tooth fracture risk vs rigid nylon. | Weight-bearing bones (marrow bones, knuckle bones)—these are harder than dog tooth enamel (Mohs hardness: enamel = 5, bone = 3-4, but weight-bearing beef femur is denser than enamel at the cortical bone surface). Slab fractures of the carnassial tooth are the #1 dental breakage from bones—$800-2,500 root canal. |
When a baby tooth does not fall out before the adult tooth erupts, the adult tooth is forced into an abnormal position. The result: two teeth occupying one socket—a deciduous canine sitting next to the adult canine, creating a food trap between them that accelerates periodontal disease at that site. This is most common in small-breed dogs (Yorkies, Maltese, Chihuahuas) and brachycephalic breeds (Pugs, Bulldogs). The retained tooth must be extracted under anesthesia—it will not fall out on its own if the adult tooth is already fully erupted. Extraction is typically performed during spay/neuter at 6-8 months. Delaying extraction risks permanent malocclusion (the adult tooth grows crooked and cannot be corrected without orthodontics).
Dr. Ian Dunbar's puppy bite inhibition protocol (developed at UC Davis School of Veterinary Medicine, published in Before and After Getting Your Puppy) is the gold standard for teaching a puppy to control jaw pressure. The principle: puppies naturally learn bite inhibition from littermates—when a puppy bites too hard during play, the bitten puppy yelps and stops playing. The biting puppy learns that hard bites end fun. You replicate this: when the puppy's tooth touches your skin, yelp "OUCH!" (high-pitched, mimicking a littermate) and immediately stop interacting for 15-30 seconds. Then resume play. The puppy learns: hard mouth contact = fun stops. Over 2-4 weeks, the puppy's bite pressure decreases progressively. By 18 weeks, the puppy should show zero skin contact during play—licking and nuzzling replace biting.
The Dunbar protocol has two phases: Phase 1 (weeks 8-16): reduce bite pressure. The puppy can mouth, but must not press hard. Phase 2 (weeks 16-20): eliminate mouthing entirely. Skin contact of any kind ends interaction. The critical error owners make: skipping Phase 1 and punishing any mouth contact from day 1. A puppy that never learns to modulate bite pressure becomes a dog that, if startled or in pain, bites at full force—it never learned its jaw's power. A puppy that went through Phase 1 correctly will, as an adult, grab your hand with zero pressure even in a panic situation.
For redirecting biting to appropriate objects: Kong Puppy ($7) stuffed with peanut butter and frozen. When the puppy tries to mouth your hand, replace your hand with the Kong. The puppy learns: chew toy = good things happen; human hand = boring. View Kong Puppy → View Benebone →
For the full puppy preparation checklist, see our puppy essentials guide. For preventing dental disease in adulthood, see our dog dental disease guide.
Disclosure: PetCarePicks is a participant in the Amazon Services LLC Associates Program. Teething timeline from veterinary dental textbooks and AAHA puppy care guidelines. Bite inhibition protocol from Dr. Ian Dunbar's published work, Sirius Dog Training. Mohs hardness values from mineralogy reference databases.