Oral-B iO Series 8 vs Philips Sonicare DiamondClean Smart 9300
Over three years, with heads at each maker's own pack price, the Philips Sonicare DiamondClean Smart 9300 costs about $297 to the Oral-B iO Series 8's $315. The Oral-B iO Series 8 has an ADA Seal listing; none was found for the Philips Sonicare DiamondClean Smart 9300. They also move differently: see the oscillating-versus-sonic explainer for what the evidence does and doesn't say about that. Every other published figure for both is in the table, with the rows where they differ tinted.
Oral-B
Oral-B iO Series 8
~$250
For $30 over the iO7, the iO8 swaps in a color screen, restores Super Sensitive for six modes in all, and ships three heads instead of two.
Best for: A color screen and every sensitivity setting short of iO9 money
Philips Sonicare
Philips Sonicare DiamondClean Smart 9300
~$230
Philips' inductive charging glass returns on the DiamondClean Smart 9300, along with real-time app coaching on pressure, motion and coverage.
Best for: App coaching during the brush, not just a log afterwards
| Specification | Oral-B iO Series 8 | Philips Sonicare DiamondClean Smart 9300 |
|---|---|---|
| Approx. price | ~$250 | ~$230 |
| 3-year cost | ~$315 ($250 handle + 9 heads at $7.22) | ~$297 ($230 handle + 10 heads at $6.66) |
| Type | Oscillating-rotating | Sonic |
| Motion | Oscillating-rotating (round head) | Sonic (vibrating head) |
| Speed (maker's figure) | not published | 62,000 brush movements / min |
| Motor | iO magnetic drive | not published |
| Pressure sensor | Multi-signal pressure sensor: Signals if you brush too hard, too soft or just right | Multi-signal pressure sensor: Ring lights up purple, with vibration and a pulsing sound |
| ADA Seal | Listed: Oral-B iO Series | No listing found |
| Timer | 2-minute timer | 2-minute timer |
| Quadrant pacer | not published | Yes, every 30 seconds |
| Modes | 6: Daily Clean, Whitening, Gum Care, Sensitive, Intense, Super Sensitive | 4: Clean, Deep Clean+, Gum Health, White+ |
| Intensities | not published | 3 |
| Screen | Color screen | None |
| App | Yes | Yes |
| Battery | not published | 14-day battery (Philips spec: operating time 14 days) |
| Charging | charging stand | charging glass |
| Travel case | Yes | Yes |
| Heads in the box | 3 | 2 |
| Head family | Oral-B iO | Sonicare click-on |
| Head compatibility | Compatible only with Oral-B iO replacement heads | Any Philips Sonicare click-on head (C1 SimplyClean, C2, C3, G3, A3, W); not Philips One heads |
| Price per head | $7.22 (Oral-B iO Ultimate Clean 9-count, $64.99 on oralb.com) | $6.66 (Sonicare SimplyClean 6-pack (HX6016/77), $39.96 on usa.philips.com) |
| Replace heads every | 3 months (maker) | 3 months (maker) |
| Warranty | 2 years | 2 years |
| First listed | not published | 2024 |
Oral-B iO Series 8: what it gives up
- Travel case doesn't charge; the iO9's charging case is most of its $80 premium
- Lacks the iO9's Tongue Clean mode
- Three hours to charge on the magnetic charger, per Oral-B, but no figure for how long it runs
Philips Sonicare DiamondClean Smart 9300: what it gives up
- 14 days per charge, a week short of the cheaper Series 6500 and 7100
- Travel case doesn't charge; the 9700 adds a charging one, four more heads and Tongue Care for $110
- $30 over the DiamondClean 9000 for largely software and a light
Full pages: Oral-B iO Series 8 · Philips Sonicare DiamondClean Smart 9300