How to Brush and Choose a Toothbrush: Modified Bass Technique, Bristle Firmness and Cleaning the Back Molars

What is the right way to brush?

The widely recommended method is to place the bristles at a 45-degree angle where gum meets tooth and brush one tooth at a time with short vibrating strokes (modified Bass technique) [1]. Hold the brush lightly, like a pencil, so you do not press too hard, and make several small movements in one area before moving on [1]. Both cavities and gum disease are caused by plaque (a bacterial film), so the purpose of brushing is to physically scrape that film away every day [1].

Element	Details
How to hold the brush	Lightly, like a pencil [1]
Angle	45 degrees at the gum line [1]
Motion	Short vibrating strokes, one tooth at a time [1]
Force	Gentle: thoroughness over pressure [1]

Dentists emphasize different methods such as the roll or Bass technique because detailed advice varies with whether cavity prevention or gum care comes first and with each person’s teeth and gums [1]. When DentStat analyzed about 3,600 patient comments on brushing and toothbrushes from YouTube dental content, frustration that “every dentist says something different” and questions like “where can I buy the toothbrush in the video?” appeared repeatedly [3].

How do I clean the back molars and other hard-to-reach areas?

The suggested approach is to use a small-headed brush, clean one surface at a time, and for the inner side of the last molar, tilt the brush upright and use the tip bristles [2]. The inner side of the molars, the grooves of the chewing surfaces and the spaces between teeth are typical spots bristles struggle to reach, and a brush with a large head or stiff bristles has trouble getting into corners [2]. The comment analysis also often showed questions like “the outside gets clean, but not the back molars” [3].

Which bristles should I choose?

A soft-bristled brush with a small head is the basic recommendation [2]. Some believe extra-fine (tapered) bristles clean between teeth better, but their narrow contact area can make plaque removal less efficient, so flat, dense bristles are sometimes recommended [2]. The exception is very crowded areas, where thin bristles can get in [2]. There is no special or expensive brush; a standard small-headed, soft-bristled brush from any store is described as enough, and the criteria are head size and bristle firmness, not a particular product [2]. “Where can I buy the small toothbrush in the video?” was one of the most frequent questions in the comment analysis [3].

Is harder and longer brushing cleaner?

No. The key to removing plaque is not pressure but thoroughness in cleaning every part of the gum line, and scrubbing hard from side to side can cause wear at the neck of the tooth (cervical area), gum recession and sensitivity [1]. Not missing any areas matters more than the time itself, and with practice it is said to take less time [1]. Waiting a little before brushing right after acidic food such as soda or fruit is also sometimes recommended [1]. In the comments, both the burden of “10 minutes is unrealistic” and complaints that “scrubbing hard makes my teeth sensitive” were seen [3].

Common misconceptions and the facts

• Myth: “You have to scrub hard to get clean.” → Fact: Thoroughness matters more than force, and too much pressure can cause wear at the tooth neck and gum recession [1].
• Myth: “Extra-fine bristles clean better.” → Fact: Their narrow contact area can be inefficient for removing plaque, so flat, dense bristles are sometimes recommended [2].
• Myth: “Brushing is for removing food.” → Fact: The purpose of brushing is to remove plaque (bacterial film) stuck to tooth surfaces; food between teeth is the job of floss and interdental brushes [1].
• Myth: “There is a special or expensive toothbrush you need.” → Fact: A standard small-headed, soft-bristled brush is described as enough [2].

Dental visits and oral care in general are covered in the oral care basics guide, cleaning between teeth in the gum disease guide and scaling guide, and regional clinic data in Find a dentist.