You should not eat fruit after brushing your teeth at night, and you should not eat anything after brushing your teeth at night, and you should not drink any drinks, milk, yogurt or other liquids with sugar, but only plain water or clear water. If you eat after brushing your teeth, there will be food residue left on your teeth, which will gradually form plaque and calculus if not cleaned in time, leading to gingivitis, periodontitis and other periodontal diseases. If you eat after going to bed at night, it will lead to bacterial infection on the hard tissues of the teeth, and the bacteria will metabolize and produce acid to form tooth decay, which will lead to demineralization of the hard tissues of the teeth and the formation of cavities, and further development may lead to the occurrence of pulpitis and other diseases. Therefore, after brushing your teeth at night, you should not eat anything such as fruits or drink any beverage.