Hello I am a patient who has been with a large cavity on a molar tooth for almost 7 years .No matter how much I brush I don't know how I got infected by cavity and some people who don't brush much and just brush for 1 min their tooth are healthy with no cavity but my tooth is of low quality I guess. So I thought of going to the dentist earlier but then got busy day by day and now it's been 7 years left untreated.Sometimes I can eat and chew food but sometimes I cannot chew because the food used to filled the cavity that pains a lot so what should I do in this case and extraction is better or root canal treatment help me in this what's best thank you