Many people brush every day and still develop decay in the gap between two teeth without knowing. This kind of decay is hidden, so it is often found only once it has gone fairly deep.
- Decay between teeth forms where two teeth touch, which a toothbrush barely reaches, so it is hard to notice.
- Possible signs include food catching in one gap, floss that shreds or smells, and sensitivity between two teeth.
- Dentists often use X-rays to see decay the eye cannot find.
- Cleaning between teeth daily and having regular check-ups are the most important ways to prevent it.
What is decay between teeth?
Decay between teeth is a cavity that forms on the surfaces where two teeth touch. This is where food and plaque collect most easily, and where a toothbrush reaches least well. Bacteria there turn sugar into acid and slowly wear away the enamel.
Because the cavity hides between two teeth, the tooth can look perfectly normal from the outside. You may also read our article on decay in adults to understand the general process.
Why is it hard to detect?
- A hidden position: the cavity starts inside the gap and cannot be seen with an ordinary mirror at home.
- Little pain at first: early enamel loss usually does not hurt, so it is easy to ignore.
- A small surface opening with a wider cavity inside: the outer enamel may look intact while the layer beneath is already damaged.
Signs that may suggest it
- Food keeps getting stuck in the same gap.
- Floss shreds, tears or comes out with an unpleasant smell.
- Sensitivity to hot, cold or sweet food between two teeth.
- A dark shadow or a change of colour in the gap under a light.
If food keeps catching in one gap, you can also read our article on why food keeps getting stuck between teeth.
How do dentists find it?
Besides looking with a mirror and instruments, dentists often use an X-ray to see decay between teeth that the eye cannot detect. This is one reason regular check-ups matter: many cavities between teeth are found while they are small, and treating them is simpler.
How can you prevent it?
- Clean between your teeth every day with floss or interdental brushes, at least once, usually in the evening.
- Brush twice a day with fluoride toothpaste.
- Cut down on sugary snacks and sweet drinks between meals.
- Have regular check-ups so the dentist can examine the hidden areas.
You are welcome to walk in during opening hours at Nha Khoa Kỳ Hòa, 266A - 268, 3 Tháng 2 Street, Hòa Hưng Ward, Ho Chi Minh City, or call the hotline 028.3868.1097 (Zalo 082.299.3377) to ask about quieter time slots.
Frequently asked questions
Does decay between teeth heal by itself?
Once enamel has worn into a cavity it does not heal on its own. If it is found early, the dentist can clean it and place a small filling, so please come in if you suspect it.
Can a toothpick replace floss?
Toothpicks can hurt the gum and do not clean the gap as well as floss or interdental brushes. It is better to use proper cleaning tools.
How often should an X-ray be taken to check for it?
That is up to the dentist and depends on each person's risk of decay. Simply ask during a regular check-up.