| Mouth mirrors are one of the most compatible inventions. Its usage has prevented dentists from crouching and trying to work in difficult postures. Normally used in No. 4 and No. 5 sizes, a smaller No. 2 is also very nifty. Its best use is allowing indirect vision to the dentist. It reflects light onto desired surfaces, and helps in retracting of soft tissues like tongue and cheeks. The posterior (or lingual) surface of the frontal maxillary teeth is where this tool is used. AB dental and Abbott Labs are experts in manufacturing Mouth Mirrors, priced reasonably between $40 and $250 each. Made up of stainless steel and high density mirrors these are extremely hygienic.