It is absolutely not possible to carry out these interventions in the following situations:
- HEART: heart diseases affecting the valves (valvulopathies), recent heart attack, severe heart failure, cardiomyopathies.
- MISCELLANEOUS: certain bone diseases, cancer in progress, certain immunological diseases, immuno-suppressive treatments, AIDS declared, organ transplants pending, certain psychiatric diseases, highly irradiated jawbones (radiotherapy treatment), treatment of osteoporosis or certain cancers with biphospnonates.
Complications (in case of oral surgery or implants) CAN BE SERIOUS.
For children, it is not possible to place an implant before the end of the growth of the jaws (usually 17-18 years).
These operations will be performed on a case by case basis, with caution in the following cases: insufficient bone, certain diseases of the mucous membrane of the mouth, periodontal disease (loosening), gums need to be cleaned and the disease stabilised beforehand, severe bruxism (patient clenching his teeth), unbalanced occlusal relationship (between the upper and lower teeth), infections of the neighbouring teeth (pockets, cysts, granulomas), severe sinusitis, poor hygiene of the mouth and teeth.
This list is by no means exhaustive and contraindications are left to the discretion of the practitioner who examined you.
Anaesthetic risk, non-osteo-integration of the implant, infections, haemorrhages (not serious in most cases), nerve damage.
Late failure - several years after placement - may be due to mechanical factors, loosening of the implant (as with a natural tooth), lack of hygiene or poor general condition.
Bleaching is not recommended in many cases, especially for children's and teenagers' teeth, as well as for teeth with caries, wear or abrasion lesions, hypersensitivity (teeth that are very sensitive to cold), large or non-tight fillings.
Bleaching products, especially if used in high concentrations or repeatedly, have a demineralising effect on the hard tissues of the tooth and increase their permeability; in addition to the risk of mechanical embrittlement of the tooth, the dental pulp may be more exposed to chemical and thermal aggression. Finally, these products react with dental filling materials (amalgams, composites) and can damage the junction between the tooth and the filling, thus encouraging infiltration and recurrence of caries.
In view of these risks and contraindications, an examination of the teeth and the oral mucosa by the practitioner is essential before any tooth whitening treatment.
Source : http://www.sante.gouv.fr/quels-sont-les-risques-y-a-t-il-des-contre-indications.html
Contraindications are parafunctions (bruxism), occlusal disturbances (too much malpositioning of the teeth), teeth that are too decayed, or periodontal problems (gum disease).