Whenever you eat or drink anything sweet, your teeth become exposed to acids for up to one hour. This is because the sugar will react with the bacteria in plaque (the sticky coating on your teeth) to produce harmful acids. So if you really must have sugary foods or drinks it is better just at mealtimes, limiting the amount of time your mouth is at risk.
Acidic foods and fizzy drinks can be just as harmful. The acid ‘erodes’ or dissolves the enamel, exposing the dentine underneath. This can make your teeth sensitive and unsightly. This is also true for carbonated (fizzy) water.
A diet that is rich in vitamins, minerals and fresh fruit and vegetables can help to prevent gum disease. Gum disease can lead to tooth loss and cause bad breath. The diagram below is a good example of what you should eat as part of a healthy and balanced diet.