There are four main categories of prohibited melacha related to brushing teeth on Shabbos with a REGULAR toothbrush. These issues vary for individual communities and contemporary poskim.

Now, thanks to the new Kosher Innovations™ Shabbos Toothbrush™, these melachos are avoided, allowing you to brush your teeth on Shabbos according to all opinions. The melachos are: Sechitah, Chavalah, Memareach and Uvdin D’Chol

Sechitah: Squeezing liquid out of a solid in which it was absorbed is prohibited on Shabbos. When wet, densely packed nylon bristles of a regular toothbrush are pressed against the teeth, many poskim consider it is as if the water is squeezed out of the bristles and forbid using a wet toothbrush. The rubber bristles of the Shabbos Toothbrush™ are far enough apart that it is obvious that liquid does not get absorbed into the bristles and is not squeezed out.

Chavalah: Causing oneself to bleed on Shabbos is prohibited. Sharp nylon bristles of a regular toothbrush can cause gums to bleed.

The soft rounded rubber bristles of the Shabbos Toothbrush™ do not cause bleeding. In the extremely rare case that very sensitive gums bleed even with the Shabbos Toothbrush™, consult your local Rabbi and see your dentist!

Memareach: Spreading a cream or ointment onto an object used as an applicator to the body is prohibited on Shabbos. Therefore, most poskim prohibit use of regular toothpaste or gel applied to any toothbrush.

Uvdin D’Chol: If a regular activity involves something that one may not do on Shabbos, that activity will be classified as a “weekday activity”. For some poskim who permit the use of a regular toothbrush without toothpaste this prohibition would apply to using one’s weekday toothbrush and they require a separate and even distinctive toothbrush for Shabbos. The Kosher Innovations Shabbos Toothbrush™ was designed specifically for Shabbos and not for weekday use, eliminating the issue of Uvdin D’Chol according to all poskim.