Yes, they do. In fact, their teeth never stop growing, so they need plenty wooden chew toys for teething. If your Guinea Pig isn't interested in the teething toys, buy ones with favor or scent that encourages chewing. I hope this answers your question.
You should not have to worry about keeping your guinea pigs teeth straight they should stay straight on their own if they arent this could mean they are loose and you should contact a vet immediatly.
Guinea Pigs are Rodents, and their teeth are always growing. Provide them with materials to gnaw on, and they will take care of their own teeth.
They need teeth to eat.
No.
YES
Take it to the guinea pig dentist
Your little pig may not be o.k. I'm not professorially sure but i think guinea pigs don't lose their teeth so you should talk to your local or personal vet.
Their teeth are about the same size as a rats.
guinea pigs have 24 teeth
ask a petstore person
If a guinea pig losses it's front teeth it could chew with their back teeth.
You can give your guinea pigs any fruit but not too much acidy fruits as it is bad for their teeth and stomachs.