Halitosis is the term, which is used to describe any type of bad breath of either oral or gastrointestinal origin.
Handpiece is the kind of an instrument, which is used to hold and revolve burs during the dental operations.
Hematoma is called the swelling of effused blood, which occurs beneath the surface of the tissue.
Hydrogen Peroxide is the name of the disinfection solution, which is usually used in the procedures of dental irrigation, as well as mouth rinse.
Hygienist is called the dental auxiliary, who instructs on the teeth cleaning techniques, administers local anesthetic and performs periodontal scaling.
Hypersensitivity is the tooth problem, when a person experiences a sudden, sharp and / or painful reaction, when exposed to chemical, hot, cold, mechanical, osmotic (either sweet or salt) stimuli. 

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Iatrogenic Disease is the condition, when a second molar tooth is inadvertently impacted by a poorly placed molar band. This condition is considered to be the one of the “doctor – caused”. 
Imaging Diagnostic is what includes, though is not limited to CAT scans, MRIs, photographs, X – rays, etc.
Immediate Denture is either a complete or partial denture, which is made before the human’s natural teeth get extracted and placed right after it.
Implant is the name of a post, which is implanted into the bone. After this post has been implanted, it becomes possible to place a bridge, crown or denture over it in order to restore the function and esthetics of the tooth / teeth.
Implantation is the process, as well as the result of an artificial or natural tooth placement into an alveolus.
Incentive Program is the kind of a dental plan, in which the benefit percentage increases each ear as the patient receives annual dental care (it is called preventive treatment). In case if the patient does not visit his or her dentist in a regular manner, this benefit percentage drops back to the level, at which it started.
Indirect Pulp Canal is the kind of a procedure, during which the nearly exposed pulp is being covered with a special protective tissue, to provide protection of the pulp from any additional injury as well as to promote healing and repair via formation of secondary dentin.
Infiltration the term, used to describe the procedure of local anesthesia, during which the anesthetic is placed under the gum, letting it to seep into the bone. This method proved to be quite effective for upper teeth, as well as for soft tissue.
Inlay is the word, which is used to describe the filling that is cemented into the tooth, and which can be gold, porcelain or even composite. In case if this filling is out of the teeth, it is called Onlay.
Intrinsic Stain is the type of permanent stain, which is caused by some certain chemical substances or other materials ingestion, occurring during the tooth development process. This type of stain can not be removed.