Did you know that teeth are hollow? “Pulp” is the term we use to describe the soft tissue, containing blood vessels and nerves, which inhabits the hollow space within each tooth. This anatomical design of teeth is what makes toothaches so very painful.
Even though dentin is hard and feels solid to the touch, it's actually microscopically porous and needs a covering of enamel or an artificial crown to protect
Cavities
Tooth cavitiesare small holes caused by a buildup of bacteria and acid on the surface of a tooth. Left untreated, they can grow deeper into the tooth Pulpitis
Pulpitisrefers to inflammation of the pulp, often due to an untreated cavity Periodontal Disease
Periodontal diseaseis sometimes called gum disease. It’s an infection of the gums. Common symptoms include red, swollen, bleeding, or receding gums Malocclusion
Malocclusionis the misalignment of teeth. This can cause crowding, underbites, or overbites. It’s often hereditary, but thumb-sucking Bruxism
Bruxismrefers to grinding or clenching your teeth. People with bruxism are often unaware that they have it Abscess
A tooth abscess is a pocket of puscaused by a bacterial infection. It can cause tooth pain that radiates to your jaw, ear, or neck Tooth Erosion
Tooth erosion is the breakdown and loss of enamel caused by acid or friction. Acidic foods and drinks, can cause it Tooth Impaction
Tooth impaction happens when there isn’t enough space for a new tooth to emerge, usually due to overcrowding. It’s common in wisdom teeth
Group of fictional characters
In the fictional Bleach manga/anime universe, a Hollow> is a type of monstrous lost soul who can harm both ghosts as well as and humans.
Many of the series' antagonists are hollows.
Some hollows possess the characteristics called vanchor>vanchor-text>arrancars> that are similar to those of a Soul Reaper.
One of the series' main storylines has Sōsuke Aizen and his arrancar as the force opposing the protagonists.