A composite tooth filling is the clinical term for a white filling, and is made of a plastic-based material. Understand how composite tooth fillings work and how they are formed to a tooth with information from a licensed dental assistant in this free video on dental hygiene. Expert: Michelle McPhail Contact: www.MySolutionz.com Bio: Michelle McPhail is a dental tech and the office coordinator at one of the most popular cosmetic dentistry centers in the Tampa Bay area. Filmmaker: Christopher Rokosz