I have moved your thread to the Health/Illness section. It is specifically monitored by some experienced members, so we can help any guinea pigs in distress as quickly and best as possible.
Please see a vet as soon as you can; he needs to check for damage to the teeth and jaw bones or cuts to the tongue/lips. Freak accidents can happen and they can really panic you!
Recommended UK vets:
Guinea Pig Vet Locator
Recommended vets in other countries:
Veterinarians - The GLX-Files
Depending on the findings, you may want to ask for a painkiller. You piggy may also have problems with picking up food in the coming days. It would be good if you considered stepping in with syringe feeding mushed up pellets/or half mushed pellets and recovery food to cover the fibre that should make up most of the food intake and grate, finely slice or mush any veg you are normally feeding.
Here is our illustrated step-by-step by guide that tells you exactly what and how and also what you can do in an emergency with what you have got at home.
Complete Syringe Feeding Guide
Tips For Vet Visits
Could you please add your country, state/province or UK county to your details, so we can tailor any advice to what is doable and possible where you are. We have got members and enquiries from all over the world. You can do so by clicking on your username on the top bar, then go to personal details and scroll down to location.