Brush, brushing, toothbrush: object, action, process
Three words from one root, and they are not interchangeable:
- toothbrush — the object
- brush — the verb: brush your teeth twice a day
- brushing — the process as a noun: brushing technique, supervised brushing
Floss behaves identically: dental floss is the object, floss the verb (floss before brushing), flossing the process. Almost every hygiene object in English also works as a verb, and these verbs are standard rather than colloquial.
Uncountables that trip learners up
Toothpaste, floss and mouthwash are uncountable. You cannot buy a toothpaste — you buy toothpaste, or a tube of toothpaste. Same for a floss and a mouthwash.
Countable neighbours sit right next to them: a toothbrush, a brush head, an interdental brush, a floss pick, a disclosing tablet. The pattern is object-countable, substance-uncountable, and the two appear in the same sentence constantly.
Bristles is normally plural: soft bristles, medium bristles, hard bristles — a brush is described by its bristles, rarely by one bristle.
The interdental group, in order of what it does
The biggest-selling and most confused section:
- dental floss — waxed or unwaxed; the flat variant is dental tape
- floss pick — floss on a handle; floss holder is the handle; floss threader feeds floss under a bridge
- superfloss — the combination type used around implants and orthodontics
- interdental brush, also sold as interproximal brush
- single-tufted brush — one small tuft for crowded or orthodontic sites
- water flosser and oral irrigator — the same device, consumer name and clinical name
Fluoride: ingredient, product and procedure
One word covers three different things, and recommendations distinguish them:
- fluoride — the ingredient itself
- fluoride toothpaste, fluoride mouthrinse — home products
- fluoride varnish, fluoride gel, topical fluoride — professionally applied
- fluoride supplement — systemic, as drops or tablets
The surrounding prevention vocabulary: fissure sealant, remineralization, xylitol, caries risk assessment, and recall interval — how long until the next check-up.
Collocations worth memorising whole
- Brush your teeth, floss between your teeth, rinse with mouthwash — each verb has its own preposition pattern
- Twice a day, not two times in a day
- Plaque is pronounced /plɑːk/ and is uncountable
- Scale and polish is the British name on an invoice for what US practices call a prophy or cleaning
- Recall as a noun means the next scheduled visit, not a product recall
- Disclosing tablet and disclosing solution stain plaque to make it visible — disclose here means reveal, nothing to do with disclosure of information
