Major RAS
ulcer
MINOR, ULCER
The mean USS score before treatment of 12 major RAS subjects was 42.1 ± 5.5 (range 35–53), and this decreased significantly after 3 and 6 months of treatment (p < 0.01) (Tables 
Comparison of responses of patients with major or minor RAS to three different therapy regimes over twelve months (USS mean ± SD).

29.2 ± 3.9(22–36)

42.1 ± 5.5(35–53)

28.8 ± 4.4(20–37)

40.6 ± 4.1(35–48)

31.0 ± 3.3(25–36)

40.2 ± 5.5(33–53)*Indicates statistically significant decrease compared with the score on the previous visit (p < 0.05). USS = ulcer severity score