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If you've just had a meal but don't have access to water, a brush and toothpaste, pop in a stick of sugar-free gum. Dentist recommended this as an adequate substitute until you can brush your teeth properly. Chewing gum will also help remove bits of food that may be lodged between teeth.
Do you have a ice-chewing habit? If so, stop it immediately. Chewing ice can cause chips and cracks. It can also irritate sensitive nerve endings. Sugarless gum is a far better option. If you are accustomed to chewing the ice in your drinks, don't use it until you break the habit.