1. 1

2. Main Categories Portability User Friendliness Flexibility Durability

3. Portability Decreased thickness leads to less use of material. Imperfections of the current toothbrush: Too thick Uncomfortable to use Not portable at all

4. Portability Decreasing the length which leads less use of material Imperfections of the current toothbrush: Too long Hard to carry in a bag

5. User Friendliness Comfortable grip Imperfections of the current toothbrush: Cheap rubber Slippery surface

6. User Friendliness Internal Toothpaste Dispenser

7. User Friendliness Easy to press the power button Imperfections of the current toothbrush: Requires too much effort to press the button Rubber layer on it absorbs the force

8. Flexibility Rechargeable battery Imperfections of the current toothbrush: Requires buying new batteries – too costly Loses efficiency as the battery level goes down

9. User Friendliness Internal timer

10. Flexibility Exchangeable brush tips Imperfections of the current toothbrush: Requires buying the entire part Not eco-friendly Too costly

11. Durability Strong Body