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I’m not sure to be honest. If you’re worried you’re best off taking him to a vet. But just be aware that not all who treat guinea pigs are experienced with doing dentals (if it’s needed). I’ll tag @furryfriends (TEAS)
The front incisors look normal to me, but it's the teeth at the back that you can't see easily that are usually the cause of dental issues. Sometimes the incisors look fine while the molars in back will be overgrown or have spurs, causing pain and causing your guinea pig to go off their food. Usually by the time the front incisors look abnormal, the back molars are VERY abnormal. So you're doing the best thing by taking your piggie to a vet to get a good look at the back teeth! Best wishes and hope it's just an off-day for him and no issues!