The iO Series 9 have a total 7 brushing modes including:1-Daily Clean, 2-Sensitive, 3-Super Sensitive, 4-Gum care, 5- Intense, 6- Whiten, 7-Tongue Cleaner The iO Series 8 has 6 cleaning modes and lack the Tongue Cleaner. The iO Series 7 and Series 6 have 5 cleaning modes and the Super Sensitive & Tongue Cleaner are not available in these models.