metals used in denture construction. 5% hydrochloric acid is another type of acid cleanser. in this case, the denture is immersed in the hydrochloric cleanser to soften the calculus so that it can be brushed away. the acid can cause damage to clothes if accidentally spilt, and can cause corrosion of cobalt-chromium or stainless steel if immersed in the acid often and for long periods of time. other denture cleaning methods other denture cleaning methods include enzymes, ultrasonic cleansers and microwave exposure. a cochrane review found that there is weak evidence to support soaking dentures in effervescent tablets or in enzymatic solutions, and while the most effective method for eliminating plaque is not clear, the review shows that brushing with paste eliminates microbial plaque better than inactive methods. there is a need for studies to provide reports about the cost of materials and the negative effects that may be associated with their use, as these factors could affect the acceptability of such materials by patients which will in turn affect their effectiveness in a daily setting in the long term. putting dentures into a dishwasher overnight can be a useful shortcut when away from home. additionally, further studies comparing the different methods of cleaning dentures are needed. broken dentures dentures sometimes break, often during eating or when dropped during cleaning. a repair or replacement should be sought as soon as possible to restore function and aesthetics; the continued wearing of a broken denture results in unnecessary intra-oral tissue irritation, which may result in an increased risk of infection and other pathologies including malignancies.