Direct answers to common wrong-fit questions and an explanation of Unknown status.
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Common questions
Do Oral-B iO heads fit Pro handles?
No. iO heads are for iO handles, while Pro uses the standard system. Read the full guide →
Does Philips One take standard Sonicare heads?
No. Philips lists a separate Philips One head system. Read the full guide →
Can I use STW heads on a Waterpik SR-3000?
Do not interchange them. Waterpik lists different STW and legacy SR families. Read the full guide →
What does Unknown mean?
No explicit pair verdict is present here. It does not mean yes or no. Read the full guide →
Can I compare live prices?
No live price feed is included. Enter a current price into the cost calculator. Read the full guide →
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Sources and scope
- Oral-B replacement-head fit guide · manufacturer; web search excerpt; retrieved 2026-10-30
- Philips brush-head system guide · manufacturer; web search excerpt; retrieved 2026-10-30
- Sensonic Standard · manufacturer; web full text; retrieved 2026-10-30