Neem tree is a source of neem leaves, its useful as many diseas are cured by neam leaves (:

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Though the neem leaves taste bitter they find their use in the medicinal products. They have a great medicinal property.
They are also helpful in curing chicken pox, axemia, fungal infections etc.
Its twig are used as toothbrushes in rural areas.
Its leaves are mashes & eaten to clear internal toxins.