Question

your answer
before modern toothbrushes were invented, people relied on materials from nature to keep their teeth healthy.
sentence menu - drag sentences from here to use in your answer.
later, the first bristles for an early model of the toothbrush were made out of hog hair.
for example, some ancient civilizations used “chew sticks” made from twigs, feathers, bones, and other animal parts to clean their teeth.

Explanation:

The given sentences describe the history of tooth - cleaning materials before modern toothbrushes. The first sentence sets the context, the third sentence gives examples of natural materials used by ancient civilizations, and the second sentence shows the development of early toothbrush bristles.

Answer:

Before modern toothbrushes were invented, people relied on materials from nature to keep their teeth healthy. For example, some ancient civilizations used "chew sticks" made from twigs, feathers, bones, and other animal parts to clean their teeth. Later, the first bristles for an early model of the toothbrush were made out of hog hair.