What area in the mouth is more affected by gingivitis (etc back teeth, front)?

The ones not wanted: Which ever area is not cleaned well enough, usually the areas hardest to reach. The back teeth.

Back bteeth: Generally the back teeth and the inside of the lower front teeth are affected the most. The reason is these are the hardest areas to clean and thus build up the most plaque, which in turn causes is responsible for the gingivitis developing.The same applies to the insides of the lower front teeth, and also the proximity in this area to the salivary glands. Brush and floss these areas well.

Lower anterior: It is common for people to form plaque more readily in the lower anterior teeth which then can cause inflammation.

It really varies.: While i find more plaque and calculus buildup behind the lower front teeth and the outside or buccal surface of the upper molars, I do not find a consistent pattern for gingivitis. It really varies from individual to individual and often even varies from checkup to checkup. Most individuals tend to miss certain areas when brushing and flossing and this often fluctuates from time to time.

See DDS: Patients usually have a harder time accessing posterior teeth due to proximity. If you have any concerns, see your dentist for a complete evaluation.

Individual factors: Gingivitis can be localized to one area of the mouth, or it can be generalized and localization depends on individual factors. In most cases gingivitis localization is not exclusive to a particular area.