How Often To Replace Electric Brush Heads

The ADA generally advises three to four months, sooner for frayed or matted bristles. Manuals can differ.

What matters for this question

The ADA’s general three-to-four-month guidance also calls for earlier replacement when bristles are visibly worn. Product-specific instructions can differ.
FOREO ISSA 4 hybrid and sensitive heads, for example, have different manual intervals; the date tool can use a recorded interval when available.

How to apply it

The usual three-to-four-month reminder is a starting point for standard bristles. Worn or matted bristles call for earlier replacement. When a manufacturer gives a different interval for a material or head type, keep that product-specific source with your reminder rather than overriding it.

Product records to compare

One documented model match per head; not a personal recommendation
Head family	Example fitting handle	Bristle wording	Catalog market
FOREO ISSA 4 Hybrid Brush Head	FOREO ISSA 4	Not recorded	global
FOREO ISSA 4 Sensitive Brush Head	FOREO ISSA 4	Not recorded	global
Waterpik Sensonic Contour	Waterpik Sensonic Complete Care CC-04CD010-1	soft	US

Explore this feature · Check your exact handle · Care boundaries

Sources and scope

FOREO ISSA 4 manual and replacement head guidance · manufacturer; web full text; retrieved 2026-10-30
Sensonic Contour · manufacturer; web full text; retrieved 2026-10-30