1 (e) Hermetically sealed foods are to have been processed in commercial food processing establishments meeting requirements of section 14-1.21 of this Subpart. 2  The use of home-canned foods in food service establishments is prohibited.
What causes tooth root resorption? A: A study on external root resorption in the journal Schweiz Monatsschr Zahnmed states that trauma, periodontitis, orthodontic treatment, internal bleaching, cysts, tumors or stimuli from a necrotic dental pulp may cause tooth root resorption.
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.