Mexico. Comprised of 31 states and one federal district, the nation of Mexico is home to the worldâs largest population of Spanish speakers. From the temples of Chichen Itza, to the beaches of Cancun or the bustle of Mexico City, Mexico boasts a diverse landscape and rich history. 1  Facebook. 2  Twitter. 3  Google.
Dental caries, also known as tooth decay, cavities, or caries, is a breakdown of teeth due to activities of bacteria. The cavities may be a number of different colors from yellow to black. Symptoms may include pain and difficulty with eating. Complications may include inflammation of the tissue around the tooth, tooth loss, and infection or abscess formation.
Internal factors causing tooth discoloration. 1  Teeth appear to be greyish-blue to brownish-yellow. Cause. 2  Teeth appear to be greyish-black. Cause 1. 3  Brownish-yellow or white patches at the surface of a tooth. Cause. Early tooth decay. Disturbance during the development of tooth. If a deciduous tooth is so decayed that the pulp is exposed, the bacteria, via the apex of the tooth, will cause an infection in the vicinity of the developing permanent successor.