Why guinea pig teeth never stop growing
A guinea pig's teeth are open-rooted and grow throughout its life, kept at the right length only by the grinding action of constant chewing — mostly on hay and grass. If the teeth do not meet evenly, or the pig stops chewing enough, individual teeth overgrow: cheek teeth develop sharp points and spurs that cut the tongue and cheeks, and the roots can push back into the jaw and skull. Because this happens at the back of the mouth, out of sight, owners rarely see the problem itself. What you see instead is what the problem does to eating.
The eating changes that come first
The earliest sign is usually a pig that still wants food but handles it differently — taking much longer over meals, chewing slowly or on one side, tilting the head as it chews, or dropping pieces it has started. Many pigs quietly give up on the hardest work first, eating less hay and leaving long strands, while still managing soft vegetables, which is exactly backwards from what their teeth need. Watch at feeding time rather than just checking whether the bowl empties; a pig in a group cage can look fed while actually losing every race to its companions.
Slobbers, weight loss and smaller droppings
As the mouth gets sorer, drooling appears — a persistently wet chin and chest, sometimes called slobbers, because swallowing becomes uncomfortable. Weight loss follows, and it is often the first measurable sign: a pig dropping weight at consecutive weekly weigh-ins while food is freely available has a problem until proven otherwise, and teeth are high on the list. Droppings shrink and reduce in number simply because less food is going in, and the coat may look rough as grooming and eating both decline. In advanced cases the pig approaches food eagerly, then gives up — hungry but unable.
Why you can't judge by the front teeth
Owners naturally check the incisors, and crooked or uneven front teeth do matter. But front teeth can be perfectly aligned while the molars behind them are badly overgrown, and pigs with visibly wonky incisors sometimes chew without trouble. The incisors are also affected second-hand: if the back teeth hurt, the whole bite changes and the fronts wear unevenly as a result. So treat the front teeth as one clue among several, and never let a tidy-looking set reassure you out of a weight-loss trend or a dribbling chin.
When to book — and how urgently
Book a prompt appointment for dribbling, dropped food, one-sided chewing, a pig favouring soft food, or weight loss across two weigh-ins. Treat it as same-day urgent if the pig stops eating altogether or droppings nearly stop, because a guinea pig gut that is not being fed slows dangerously. Do not attempt to look deep into the mouth yourself or trim anything — mouth gags and molar work are vet territory and easily cause injury at home. Bring your weigh-in history, kept in KinsLe's Pet Passport with the rest of your pig's records, so the vet can see the rate of loss rather than a single weight.