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Frequently Asked Questions

Frequently Asked Questions

I don't want to use my Credit card or PayPal over the internet. How do I order?
While Paypal and Securenet is one of the most secure ways to buy over the internet, we understand that some people are still concerned. Please download our order form and send it to us along with your payment via check or money order. All checks and money orders must be negotiable in U.S. dollars, drawn on a U.S. bank. We cannot accept a check written on a foreign bank even if the check is written on a US Dollars account. The costs and delays of international collections are prohibitive. For our international customers there are several ways to pay: 1) An international money order payable in US Dollars. These can be purchased at any local bank and are directly negotiable at a US bank. 2) IF your local bank has a correspondent account with a US bank, you can write a check in US Dollars, which is directly negotiable in the US. This type of check must have the name of a US city printed somewhere on the check.  
How do I select the correct size of interdental brush for me?
The best way to determine the right size brush for you is to try all the sizes and see which one works best for you. To this end, we carry variety packs of most of the interdental brushes, which has one brush in each size. We would suggest buying one of the variety packs first and trying them, so that you can find the brush size or sizes that works best for you. You can find our variety packs of interdental brushes at the link listed below:
Understanding how Interdental Brushes Sizes are classified
Interdental brushes are classified according to ISO standard 16409:2006. The International Standard Organization widely known as ISO, is an international standard-setting body composed of representatives from various national standards organizations. Founded on February 23, 1947, the organization promulgates worldwide proprietary, industrial, and commercial standards. It has its headquarters in Geneva, Switzerland. The ISO brush sizes range from 1 to 7. The ISO brush size is determined by the PHD or Passage Hole Diameter in mm. This PHD is the minimum diameter of a hole that the interdental brush will pass through without deforming the brush wire stem.
ISO Interdental Brush Dimensions:
ISO Brush Size:  Passage Hole in mm
2 0.9-1.0
3 1.1-1.2
4  1.3-1.5
5  1.6-1.8
6  >1.9











I cannot find.....?
If you cannot find your favorite oral hygiene product on our site, please send us a message via the form on the 'Contact Us' page. If you cannot find it, chances are others cannot either. We will do our best to add your favorite product to our inventory.
What shipping options do you have?
To ensure convenience, universal availability and save you money on shipping, we only ship via the US Postal Service First Class Mail system. To ensure safe and quick delivery of your order please be sure to supply us with your current and complete USPS postal delivery address - This is vital! Please Note: If the product total excedes a certain amount the products ship for free. The promotional amount that determines this is displayed at the top of the home page.
When will my order ship?
Our shipping department picks and packages your goods the next business day after your order and ships them out the second day or third day after your order. This ensures accuracy in order packing. Sometimes, this process may be delayed depending on the availability of certain products. If your order will be delayed by more than 5 business days, we may let you know via email.
Where is my order?
We track all of our orders via a USPS tracking number. If you have not received your order yet and are concerned, simply use our 'Contact Us' page to send us a message about your concern. Be sure to include your KleenTeeth order # with your message. We will trace the whereabouts of your package and email you with the details.
Where are you located?
We are located in Boston, Massachusetts in the United States of America. Our contact information:
292 Newbury St #169
MA 02115
(Not a Retail Location)
Tel: 617-209-3147 (Please try our 'Contact Us' page first)
Fax: 617-249-2023
You are located in Boston - Great! Can I swing by and buy directly from you?
While we are thrilled to have you as a fellow Baystater and potential customer, we do not handle retail sales at our Newbury Street location. Your friendly neighbourhood postal person will bring your items directly to your doorstep.
Do you accept returns?
Due to the personal hygiene nature of our goods we cannot accept returns. We do not accept 'I DON'T LIKE IT' returns. Please make sure that you are familiar with the item you are purchasing before ordering. Please pick carefully! If you have any questions about the suitability of an item - please ASK! 
I am confused, which product will work best for me?
We stock a wide variety of products to ensure that you have a large choice, sometimes this may lead to some confusion on which products to order. For interdental brushes we carry variety packs which have one size of each interdental brush in one package. We suggest you order one of these variety packs and try each brush to see which is best for you. Once you have found the best size for your needs, you can order that size in single size packs.Also to make it easier to choose which product is best for you, we have organized all our oral hygiene products by category on the left side of our website, you will find a drop-down menu with all the products we carry listed by type and size. For example you might be looking for thin interdental brushes. In this case you could select interdental brushes, then size: fine (interdental>Fine), here you will find all our fine sized interdental brushes listed by manufacturer. To get a closer look at the brushes simply click on the thumbnail picture and a larger more detailed picture will appear.
Can you tell me where in my hometown, I can find....?
We do not have a geographic distribution of stores that sell the products that we stock. Your best bet is to try a large pharmacy in your area. Also, remember we will ship the product right to your doorstep for just a $2.93, FREE if you order over $25 from us - probably less than the amount of gas you would use looking for it all over town!
Do you ship internationally?
Yes! We ship all over the world via first class mail for a flat fee of $13.75 and FREE if your order total is over $100.00. Shipping times vary, but 10-15 business days (Mon-Fri) is typical. Remember your package will have to clear customs in your country and this can take a few days. So far we have shipped to Canada, Mexico, UK, Denmark, Israel, Australia and Hong Kong to name a few.
I can no longer find ....?
Choice is nice, but it can also be bewildering. We carry a large array of different brands of interdental brushes, toothbrushes, end-tufted brushes, floss and other speciality oral hygiene devices in a varity of configurations such as soft, ultrasoft, supersoft, pocket size, travel size etc. Because of this we have made handy comparision charts for you to compare the different brands of items. You might be using a particular brand at the moment, but by looking at our comparison chart you might discover another brand in a similar configuration which you might like to give a try.
How do I compare different brands of.....?
Buying a quality oral hygiene product is only half the battle, putting it to use correctly is the key to keeping your smile looking and feeling great. To help you with this we have several 'How to Best use your ...' guides. These have been written and reviewed by US-trained dental specialists to ensure accurate information. We are always developing new guides, so check KleenTeeth/Guides ocassionally to see if we have a guide for your favorite product yet.
End-Tufted Brush Comparison Chart
Brand: Sulcabrush Tepe Curaprox GUM OralB Lactona Edel+White
Size: Full/Pocket Full Full Full Full Full Pocket
Bristle Shape: Arrow Arrow Flat Flat Flat Arrow Arrow
Bristle Stiffness: Medium Soft Medium Medium Medium Medium Soft
Replaceable Bristles: Yes Yes No No No Yes No
Source: Canada Sweden Switzerland US US Holland Switzerland
End-Tufted Brush Guide: