
If you want to keep yourself from becoming a shut-in, you better brush your teeth!
The continuous rise of hikikomori in Japan is cause for grave concern. The term is used to describe people who desperately avoid social interaction and stay in their homes for long periods of time. Hoping to study why there are more and more cases all over Japan, numerous universities have conducted studies on the phenomenon. Tohoku University released the results of their new study that detailed one particular factor that might increase the chance of someone becoming hikikomori.
The conclusion they published for an increased risk factor in hikikomori was old people with few teeth. That’s a pretty weird but specific reason, but apparently the data substantiates the claim. According to their four year study of 4,390 people in Aichi Prefecture who were 65 and over, the percentage of participants who didn’t leave their house even once during the week for those with 20 or more teeth was 4.4 percent. For those with 19 teeth or fewer but used dentures was 8.8 percent, while those with less than 20 teeth and didn’t use dentures was 9.7 percent. In fact, according to their data, when adjusted for age and general income, those who don’t use dentures and have less than 20 teeth can be one to 78 times more likely to be hikikomori. Their reasoning seems pretty simple: If the condition of your teeth is poor then you are more likely to not want to talk or eat with people. Thus it decreases the chances of you leaving the house.
All scientific studies should be taken with a grain of salt until they can be verified through a replication study, but if this is true, it seems as good of a reason as any for people in Japan to start paying a bit more attention to their teeth!
▼ Dentists all over Japan rejoice!
All parents want to do what is best for their children, and if it means furiously adhering to recommended oral hygiene regimens to ensure their offspring are productive members of society, then, by golly, they better grab some floss!
Source: Yahoo! Japan News
Top image: Flickr/Peter Fleck




Now is the time to visit one of Tokyo’s best off-the-beaten-path plum blossom gardens
Starbucks Japan releases new sakura goods and drinkware for cherry blossom season 2026
Foreign tourists in Japan will get free Shinkansen tickets to promote regional tourism
Starbucks Japan unveils new sakura Frappuccino for cherry blossom season 2026
New Totoro insulated bags are for baby bottles (but secretly for grown-up fans too)【Photos】
Now is the time to visit one of Tokyo’s best off-the-beaten-path plum blossom gardens
Starbucks Japan releases new sakura goods and drinkware for cherry blossom season 2026
Foreign tourists in Japan will get free Shinkansen tickets to promote regional tourism
Starbucks Japan unveils new sakura Frappuccino for cherry blossom season 2026
New Totoro insulated bags are for baby bottles (but secretly for grown-up fans too)【Photos】
Happy 40th birthday, Aeon! Coca-Cola celebrates with limited edition LED coaster sets
Satisfy your sweet tooth with cheesecake and more all-you-can-eat sweets at Cheese Garden
New zombie ship sets sail in Japan, includes Shinkansen tickets and all-you-can-eat sushi
McDonald’s Japan hack: What happens when you put an apple pie inside a Big Mac?
Eight Ways You Really, Really Shouldn’t Use a Japanese Toilet
Japan’s newest Shinkansen has no seats…or passengers [Video]
Foreigners accounting for over 80 percent of off-course skiers needing rescue in Japan’s Hokkaido
Super-salty pizza sends six kids to the hospital in Japan, linguistics blamed
Take a trip to Japan’s Dododo Land, the most irritating place on Earth
Can you eat lunch in Tokyo for less than 500 yen?
A look back on 40 years of Japanese schools banning stuff
New Family Mart cinema opens inside Japanese airport
Japan releases first official sakura cherry blossom forecast for 2026
Starbucks Japan releases new drinkware and goods for Valentine’s Day
Archfiend Hello Kitty appears as Sanrio launches new team-up with Yu-Gi-Oh【Pics】
China’s don’t-go-to-Japan warning looks to be affecting tourist crowds on Miyajima
Survey asks foreign tourists what bothered them in Japan, more than half gave same answer
Japan’s human washing machines will go on sale to general public, demos to be held in Tokyo
We deeply regret going into this tunnel on our walk in the mountains of Japan
Studio Ghibli releases Kodama forest spirits from Princess Mononoke to light up your home
Major Japanese hotel chain says reservations via overseas booking sites may not be valid
Put sesame oil in your coffee? Japanese maker says it’s the best way to start your day【Taste test】
No more using real katana for tourism activities, Japan’s National Police Agency says
Happy 40th birthday, Aeon! Coca-Cola celebrates with limited edition LED coaster sets
Satisfy your sweet tooth with cheesecake and more all-you-can-eat sweets at Cheese Garden
New zombie ship sets sail in Japan, includes Shinkansen tickets and all-you-can-eat sushi
McDonald’s Japan hack: What happens when you put an apple pie inside a Big Mac?
Eight Ways You Really, Really Shouldn’t Use a Japanese Toilet
Shimane has a secret hot spring town that feels like stepping into an old Japanese film
Beyond katsu curry: Tare katsu curry now being served at Coco Ichibanya
Elderly Japan man arrested for stealing toilet, using it in his home for three months
Japan law lets you claim reward for finding lost property, man may have scammed it over 60 times
Our reporter is willing to die on the pseudo-Italian restaurant Olive Hill
Tokyo’s Haneda Airport becomes fourth airport in the world to be awarded coveted 5-Star rating
Heart/body-warming anime video is a beautiful love letter to family and miso soup【Video】
How to make fancy matcha sake chocolates with just 15 minutes of real work【Recipe】
New “edible kairo” tablets claim to warm your body during winter—our Japanese writer eats the lot