A pale yellow oval citrus fruit with thick skin and fragrant, acidic juice."the juice of seven lemons".Lemon juice helps to cure problems related to indigestion and constipation. Lemon juice can treat a person who is suffering from a cold, flu or fever.

Dental Care: It is also frequently used in dental care. If fresh lemon juice is applied on the area of a toothache, it can assist in getting rid of the pain. Massaging the juice on the gums can stop gum bleeding, while eliminating the bad odors that can come from various gum diseases and conditions.
Additionally, it can be used in the regular cleansing of your teeth. Keep your eye out for a toothpaste containing lemon as one of the ingredients, or add a drop of its juice onto your normal toothpaste. Some people also rub their teeth with the outer shell (the inner side touching your teeth) of a lemon after removing the juice. But be careful, lemons are highly acidic, so if your mouth starts burning, rinse your gums and mouth quickly with water.

Consuming too many acidic foods or beverages, such as lemon water, causes extensive contact of acid with your teeth. This will erode tooth enamel and make your teeth sensitive, especially to hot or cold foods. To protect your teeth, drink acidic beverages through a straw. Citric and ascorbic acids are strong antimicrobials, which deter mouth infections, but drinking too much lemon juice can irritate mucous membranes and potentially lead to canker sores.
Drinking too much lemon with water may trigger heartburn, or make this condition worse if you’re used to experiencing it. Heartburn causes severe burning and pain in your chest. Cutting back on acidic foods and drinks helps to prevent and relieve heartburn symptoms.