What is the incorrect statement regarding water jet spray hydrotherapy?

The statement that "removes plaque" is incorrect regarding water jet spray hydrotherapy. While water jet systems are designed to assist in oral hygiene by flushing out food debris and some surface contaminants from the teeth and gums, they do not effectively remove plaque. Plaque is a biofilm that adheres to the tooth surface due to the bacterial colonies it harbors, and it requires mechanical action (like brushing) or scrubbing to be effectively removed. Water jets can help reduce plaque accumulation but are not capable of removing established plaque like traditional brushing can.

Understanding the other statements provides context for this. Water jet systems do not harm the gingivae when used correctly, making them safe for gums. They can help dislodge and remove debris from the mouth, particularly in areas that are difficult to access with traditional toothbrushes or floss. However, it's essential to note that while they aid in cleaning, they are not a substitute for mechanical cleaning methods that address plaque buildup adequately.