Guajava - Guajava demonstrates antifungal, antibacterial, anti-inflammatory, laxative, and analgesic properties. It is used to treat herpes ulcers, ringworm, dermatitis, and urinary tract infections. Guajava is related to cassia and senna, and contains anthraquinones found in those other species as well.
Vitamins B, particularly biotin (vitamin B7) and B12 are important to keep healthy nails. If your nutrition lacks in vitamins B, nails will be dry and brittle. Vitamin C deficiency is associated to brittle nails and may cause infections of nail tissues.
Possible Causes. Vitamin Deficiency. Dents in fingernails can be a sign of vitamin deficiency, especially of Vitamin B12. A diet that lacks in essential nutrients can lead to various nutritional deficiencies and dent in fingernails is a very frequent sign of these nutritional deficiencies.