This document provides a home remedy for whitening teeth using baking soda, lemon juice, and a toothbrush. The directions explain that mixing baking soda with lemon juice or water to form a paste, then brushing teeth with the paste for 1-3 minutes and rinsing can help whiten teeth within a week if done daily. The remedy is promoted as a cheap alternative to expensive teeth whitening products that can whiten teeth quickly in just 3 minutes.