I guess you can take it to the vets and ask advice from a vet - as they know lots about animals and are the best to ask.
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
Their teeth are about the same size as a rats.
guinea pigs have 24 teeth
If a guinea pig losses it's front teeth it could chew with their back teeth.
They lick them.
yes, as guinea pigs are Rodents, Rodents need sharp front teeth to cut through roots, stems, stalks, vines, ect.
Guinea pig's teeth continuously grow but you can give them small logs or hay for then to graze them on.
Adult guinea pigs have 20 teeth, which include 4 incisors (front teeth), 2 premolars, and 14 molars. Their teeth continuously grow throughout their life, so it's important to provide them with proper chew toys and a balanced diet to prevent overgrowth and dental issues.