You can eat watermelon if you have a toothache. Watermelon is a more nutritious food, which contains more nutrients, such as vitamins, trace elements, but also contains more water, good for the body, appropriate to eat some watermelon will not lead to toothache symptoms worsen, so you can eat watermelon. There is no strict dietary taboos after a toothache, usually it is best not to eat too cold, too hot, too spicy stimulating food, keep a light diet. After the appearance of toothache symptoms, it is recommended to actively seek medical examination to determine the cause of toothache, may be gingivitis, periodontitis, periapical periodontitis, pulpitis and other diseases, the need for timely symptomatic treatment.