After reading chapter 7 of the IGCSE biology book, we made a test which consisted in eating a biscuit thinking in what happens to the food after we put it into our mouth, and more especifically, when we swallow.
Once we put the food in the mouth, our teeth are responsible for biting into smaller pieces the food (in the case of the incisors and canines) and chewing (in the case of premolars and molars). Then, the amylase (which is secreted by saliva) breaks down starch into maltose, helping the food to dissolve and expand its surface, and making it start to be called a bolus. The tongue is responsible for moving the bolus into the mouth, and then helps to swallow and reaches the esophagus (a long tube that carries food to the stomach). In this way, we can see that chemical and mechanical digestion is present in the mouth, saliva is part of the chemical digestion and the movement of the tongue is mechanical.