The frequent breaking of toe nail is because of two reasons. 1) Onychomycosis- Toe nail fungus 2) Poor fitting shoes. The fungus normally grows and accumulates below the toenails because the area is moist, warm and dark, a hot place for breeding. Even if you take good care of toes and wear tight fitted shoes, you can be infected by nail fungus. This is because tight shoes block the passage of air and light, making the area dark, moist and warm. For the second reason of poor fitting shoes, one should choose a shoe which leaves half a thumb gap between the tip of inside edge of shoe and the tip of the great toe. Good foot hygiene, including wearing clean socks, rotating shoes and thoroughly drying feet between the toes to prevent further spreading of infection. One can try rubbing tea trea oil/ vinegar/ mouth wash/ hydrogen peroxide with a swab of cotton over the area and leaving them to dry for air. Do not worry if the toe nail is cut, it grows again after the fungus is cleared. It takes 4 to 6 weeks for complete growth. The specialist one has to visit for the toe nail problems are podiatrist/Dermatologist. The usage of medicines is for long time as the fungus is not easy to treat once infected. So do follow the expert's advice.