Is it harmful to brush your teeth without tootpaste?

No. : Toothpaste has minor functions. The most important is to improve taste to promote longer brushing. Fluoride provides some anti-cavity benefit. Whitening is also possible, though primarily a sales/marketing gimmick. Brushing alone will help control gingivitis and gum disease, but only minimal without cleaning between the teeth. Think about it: floss is better and you don't put toothpaste on it!

No: I have some patients that don't tolerate standard toothpastes, especially those that contain sodium lauryl sulfate or they don't like the flavors or textures of anything they have tried. If you're following a good diet that is low in refined carbs and don't have a history of decay, brushing with water can be fine.

Not directly: The most important considerations are proper technique, frequency and duration when it comes to tooth brushing. Toothpaste may produce a better cleansing action but is not essential. It often has other ingredients such as Fluoride which is more important for certain individuals than others. There is no harm in not using toothpaste, but it might be better to use it.

Yes: It is harmful to brush your teeth without toothpaste. To prevent cavities and gum disease toothpaste is a main component of oral hygiene. Also proper brushing technique and flossing is essential.