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Max Clean Bristles change from green to yellow to signal when to change your brush head to maximize your clean.Oral-B CrossAction Electric Toothbrush Replacement Brush Head Refills, Black, 3 Count - 3 ct | CVS a regular manual toothbrush The round brush head is inspired by dental professional tools for a tooth-by-tooth clean, with specially engineered bristles. Dentists recommend changing your brush head every 3 months.