Lemon slices in water is not a drug, talk about side effects, excessive consumption may cause aggravation of dental caries, skin darkening, acid reflux and so on. Lemon slices are rich in vitamin C, phosphorus, iron and other trace elements, moderate drinking has the effect of antioxidant, promote gastric digestion, has a very high nutritional value. Lemon slices are rich in citric acid and other acidic ingredients, acid residues in the teeth, may lead to dental caries; lemon belongs to the light-sensitive fruits, after drinking lemonade, if you do not pay attention to sunscreen, melanin precipitation may occur, resulting in redness of the skin, tanning and so on. In addition, it should be noted that due to the strong acidity of lemon, patients suffering from gastric ulcers, duodenal ulcers, gastric acid should try to avoid drinking, so as not to aggravate the symptoms of ulcers, gastric acid; patients with dental caries due to the destruction of dental tissues, lemonade may speed up the corrosion of the teeth, and should not be consumed. Although lemonade can help replenish some nutrients, but also pay attention not to drink too much.