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Front teeth are the incisors and the canines tear through the apple skin, the back teeth, the molars, grind the apple into a ball called a bolus. As the apple the touches you tongue, your 10,000 taste buds tell you it is sweet. The salivary glands in your mouth and throat produce a watery fluid called saliva. Saliva helps to moisten and soften the bolus and to break it down.
Where digestion begin?