Philips/Norelco electric shaver heads should be replaced every 2-18 months depending how often they are use, your hair thickness, volume and strength. As with any precision device care should be taken when replacing the heads. You should use the same replacement part that was removed to ensure a good fit that won't cause problems later.
Philips and Norelco replacement heads are interchangeable, just be sure to select the correct replacement head!
 NEW Norelco HQ 55 Shaving Heads  US $21.05
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 PHILIPS NORELCO HQ 5 SHAVING HEADS US $27.50
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 PHILIPS NORELCO COOL SKIN HQ 167 REPLACEMENT HEAD HQ167 US $26.99
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