Answer

Yes, during upavās, you may take bath and do Abhishek even if you have not brushed with toothpaste/toothbrush.

Explanation

In Jain practice, before doing Dev-pūjā, Abhishek, or visiting the temple, external cleanliness is important. Taking bath and wearing clean clothes is appropriate.

However, during upavās, many people avoid brushing with toothpaste because:

• Toothpaste may have taste or ingredients that are not suitable during fasting.
• There may be concern of swallowing something unintentionally.
• Some traditions prefer avoiding such items during strict fasting.

So, if you have not brushed, you can still clean your mouth in a simple way, such as:

• Rinsing the mouth properly with water
• Doing kulla carefully
• Using clean water without swallowing it

After that, you may take bath and do Abhishek with devotion.

Spiritual Understanding

The main purpose of upavās is inner purification, self-control, and reducing attachment to the body and taste. Cleanliness is important, but devotion, humility, and carefulness are even more important.

Takeaway

During upavās, avoid toothpaste if your tradition advises so, rinse your mouth carefully, take bath, wear clean clothes, and you may respectfully do Abhishek. If your family, guru, or temple has a specific maryādā, follow that.