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There are a lot of nutrients left on unbrushed teeth

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There are a lot of nutrients left on unbrushed teeth. It will enhance micrroorganisms activities and cause tooth decay. Alkaline toothpaste is used to prevent this problem. (a) Suggest one hypothesis to investigate the above statement. [1 mark] (b) Based on the given situation, plan an experiment to investigate bacterial growth using distilled water, sodium hydroxide solution, nutrient broth, two test tubes and other material. - Your description should include the following criteria. (i) Aim of experiment [1 mark] (ii) Identification of variables [2 marks] (iii) List of apparatus and material [1 mark] (iv) Procedure or method [4 marks] (v) Tabulation of data [1 mark]