Guinea pigs have very long teeth that are needed to break up their food, which can often be very tough. The teeth grow constantly from birth to death, and with some softer diets, this constant growth can cause problems. On occasion, guinea pigs will need their teeth to be filed down so that they can eat properly once more. This doesn’t always need a big operation, but will need to be done by a vet. The major sign that your guinea pig needs its teeth filing is that it will seem interested in food and yet not eat, or have serious trouble eating, so it’s a problem that needs to be dealt with quickly.
Bill, 16 August 2017
Good all round advice