What is normal mouth opening size?

Many muscles and nerves around your jaw work together to open and close your mouth. Most people can open their mouth 35 to 55 millimeters (1.4 to 2.2 inches), which is about the width of 3 fingers (see Figure 2).

What is the maximum opening of mouth?

Maximal opening of mouth is described as the greatest distance between incisal edge of maxillary central incisor to the incisal edge of mandibular central incisor, when the mouth is opened as wide as possible painlessly or as the inter incisal distance plus the overbite.

What is the normal size of the mouth opening?

Previously reported mean MMO has ranged from 43.3 mm (reported by Posselt6) to 59.0 mm (for men only, as reported by Travell10). In individual studies, the reported range has been as wide as 32–62 mm7(for subjects of both sexes) and 39–75 mm5(for women only). Differences have also been observed between men and women.5,9,10,16,18

What’s the average range of motion of the mouth?

Most studies show that the maximum jaw range of motion (ROM) or maximum mouth opening (MMO) is related to body size and height. So men can usually open wider than women, taller people more than shorter people. In studies, MMO for adults has generally been around 50 mm, with a range from 32mm to 77mm.

How big is the mouth of a 60 year old male?

In the age group of 51–60, the mean mouth opening was 48.3 ± 6.2 mm for males and 42.0 ± 4.6 mm for females. Similarly in the age group 61–70 years, the mean mouth opening was 45.8 ± 5.2 mm for males and 40.2 ± 6.6 mm for females.

What’s the difference in mouth opening between men and women?

For example, Rieder18 reported that men generally have a wider mouth opening than women: in that study, 83% of men had a mouth opening of 40–60 mm, whereas 87% of women had a mouth opening of 35–55 mm. Other authors have also reported differences between men and women (Table 1).