All bristles are safe,
Yes ,the bristles and the handles of toothbrush are made of the same material that is nylon.
The capitol of a toothbrush (most important part) is the bristles. Why am I answering this?
Nylon.
Yes ,the bristles and the handles of toothbrush are made of the same material that is nylon.
Disinfection with vodka is not sufficient because the concentration of ethanol is only approx. 40 %. The toothbrush is not affected.
Most dentists prefer that patients use toothbrushes that are soft because harder bristles can harm your gums and enamal, but some people only feel their teeth are clean after using a hard toothbrush.
Helpful Friction.
I'm assuming that they are attached on a small board. I would expect the plastic of the toothbrush to be put over the board and the piece over the board would have holes to allow the bristles to come through the plastic.
No. The bristles of the brush will damage the soft tissue inside.
it stands for the stiffness of the bristles but the lower the number the softer or harder?
There's not much evidence that electric toothbrushes are better than manual toothbrushes. In the case of the ones with timers, their biggest benefit is probably just getting you to brush as long as you should (two or three minutes). There is some evidence that electric toothbrushes that spin in both directions, like some made by Oral-B, are better than manual brushes. My dentist recommended a two-speed electric toothbrush. The faster speed is for your teeth, the slower speed is for your gums. You need to be gentle with your gums. If you use a manual toothbrush, go with a name brand toothbrush such as Crest or Oral-B. It's important that the bristles be rounded at their tips. You can't see this by eye. Go with soft bristles. Hard and medium bristles can cause irreversible damage to the gums, which is very bad for your teeth. They can lead to periodontal disease and receding gumlines. Replace your toothbrush every two or three months. Worn bristles clean about 30% less effectively. Moreover, worn bristles are better breeding grounds for bacteria.
No