If you want to avoid tooth decay, it may be best to stay away from acidic beverages and foods. The acid in these items can cause the enamel on your teeth to weaken. It is when your teeth are weakened that you are more likely to suffer from decay.
Always thoroughly rinse your toothbrush after using it because the germs that you just removed from your mouth will be on the toothbrush. By rinsing it off, you will remove the germs and the remnants of old toothpaste which can build up. Follow up the rinse by tapping the toothbrush on the edge of the sink to shake excess water off of it.
Make sure to replace your toothbrush on a regular basis. Usually a toothbrush should be replaced after three months. But you should replace it sooner if it becoming worn, falling apart or the bristles are bent out of shape. Some toothbrushes even come with color indicators that fade over time and let you know when it is time to be replaced.