If the toothache is caused by tooth sensitivity, you can use desensitizing toothpaste, etc. If it is caused by dental caries, you need to have a filling, etc. If there is dentin sensitivity, you may experience toothache when drinking cold or hot water. If there is dentin sensitivity, the phenomenon of toothache when drinking cold or hot water can occur, usually a transient pain. You can use toothpaste containing potassium nitrate or strontium chloride and other desensitizing ingredients to relieve sensitivity. Pay attention to the correct way of brushing your teeth and avoid brushing too hard. In addition, if there is the phenomenon of dental caries, it is easy to have hot and cold stimulation pain. It is necessary to fill the teeth in time. If the caries is deep or accompanied by pulpitis, root canal treatment is needed. If there is obvious tooth pain when drinking water, go to the hospital in time for examination and timely treatment.