Before toothbrushes were introduced in India, neem twigs were used to cleanse people's teeth. The neem twigs were chewed at the end and since it is beneficial for the teeth and gums, it also maintained health. It reduced bad breath and was easy to use.
Some even rub the sea salt in their teeth to make it white. Other use coconut oil as it has anti-fungal and antibacterial properties come in handy for mouth cleaning. Lemon juice and baking powder were also natural substitutes used in India. People from rural areas still use these natural, biodegradable toothbrushes instead of plastic ones which live on forever.