From Longman Dictionary of Contemporary Englishtoothbrushtooth‧brush /ˈtuːθbrʌʃ/ ●●● S3 noun [countable] 
DCBa small brush that you use for cleaning your teeth
DCBa small brush that you use for cleaning your teethExamples from the Corpus
toothbrush• A Colgate marketer demonstrates how to use the toothpaste and a toothbrush.• The only thing I have that will do the job is a toothbrush.• At my house Jasper kept an electric razor, a toothbrush, and he saw to it that I always had aspirin.• Do not share razors and toothbrushes.• Then I brushed my teeth thoroughly with my electric toothbrush.• Arabella's toothbrush was still in the mug above the basin.• At San Quentin, Kirkpatrick stabbed one of his lawyers 17 times with a sharpened toothbrush. 