Diets low in nutrients can lead to gum diseases and tooth decay.  Dr. Mandy Chan at Family & Cosmetic Dentistry of North Andover says that consumption of sugar, especially in sticky forms, will look to rapid tooth decay.  Local and bottled water supplies may not provide an adequate supply of fluoride, which helps prevent cavities.  Dr. Chan recommends a balanced diet and good dental hygiene habits to reduce the risk of dental diseases.