Why flossing actually matters (and why your dentist can tell if you don't)
Brushing cleans about 60% of your tooth surface. The other 40% is between your teeth.
Brushing only cleans the three exposed surfaces of your teeth: top, front, and back. The two surfaces that touch neighbouring teeth are only cleanable with interdental cleaning. That's 40% of your tooth surface that your toothbrush never reaches.
Floss vs interdental brushes
Traditional floss is excellent for tight contacts and for people who have never used interdental products. Interdental brushes (like TePe) are often preferred by clinicians because they clean a larger surface area and are easier to use correctly.
Your dentist will recommend the right size based on your gap width. It's not one-size-fits-all.
When to floss
Floss once a day, at night, before brushing. This loosens debris and bacteria so your toothpaste can work on clean surfaces.
The tell-tale signs
Your dentist can see the specific pattern of plaque and tartar build-up that results from inconsistent flossing. Tartar on the contact surfaces between teeth is a reliable indicator. It's not a trick. It genuinely shows in the examination.