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Amazon [amazon.com] has 10-Count Oral-B Pro-Health Clinical Pro-Flex Toothbrush w/ Flexing Sides for $ 13.95. Shipping is free w/ Prime or on $ 25+ or $ 35+ orders (minimum requirement varies by location).
10-Count Oral-B Pro-Health Clinical Pro-Flex Toothbrush w/ Flexing Sides $13.95 + Free Shipping w/ Prime or on $35+
Oral-B Pro-Flex Charcoal Manual Toothbrush Soft 4 Count – Prime Exclusive